Ryan Chamberlain (Jon Lindstrom)

Ryan Chamberlain was a pediatrician at General Hospital, but it is revealed that he has been hiding his mentally unstable behavior for some time.

Felicia Jones, while living in Texas, knew him as "Todd Wilson" and saw him murder his wife Gloria.

She had amnesia when she got back to Port Charles and didn't remember knowing Ryan/Todd.

Ryan becomes obsessed with Felicia, who gets her memory back and is arrested for attempted murder after he traps her in a cabin and she attacks him in self-defense.

Ryan crashes Felicia and Mac Scorpio's wedding with a bomb, but is sent to an asylum. After escaping with the help of his counselor Connie Cooper, he kills her, kidnaps Georgie Jones and dies in a funhouse explosion after a face-to-face with his brother Kevin.

Ryan continued to appear to Kevin and taunt him over the years. It was revealed that as children, Ryan was sexually abused by their mother.

One night, she abuses Kevin, thinking it was Ryan. When Kevin tells their father, he takes Kevin and leaves Ryan behind. Ryan would eventually kill his mother.

Twenty-three years later, Ryan was revealed to be alive in Port Charles and is being locked up in Ferncliff by his brother, Kevin. It was him who was communicating via morse code to Carly when she was a patient there. On August 28, 2018, Ryan escaped from his restraints and attacked his brother. He took Kevin's clothes and placed his restraints on him. He fooled the Ferncliff staff and made his way to General Hospital where everyone was fooled into believing he was Dr. Kevin Collins. After meeting Franco Baldwin and learning of his history, he has begun to like him as he reminds him a lot of himself.

On Halloween, Ryan murdered Ferncliff nurse Mary Pat Ingles by stabbing her to death and placed her decapitated head into an apple bobbing barrel for Carly to find. The rest of the corpse was placed in Ava's art gallery with a jack o lantern as its head. Ryan (as Kevin) also separated from Laura, the woman the real Kevin is married to. On November 21, 2018 Ryan finds Ava and Nina fighting in Ava's art gallery and breaks it up. He then tells Ava that he has feelings for her and they kiss and Laura walks in and sees them kissing.

On November 26, Ryan murdered Ava's daughter, Kiki Jerome by stabbing her to death in her apartment and then placed her corpse inside the Haunted Star, where it was found by newlyweds Curtis and Jordan Ashford. Ryan also hid the murder weapon in the apartment of Kiki's boyfriend, Dr. Griffin Munro, who is subsequently arrested after the knife is uncovered. However, Griffin is soon released as the PCPD suspects that the same person killed both Kiki and Mary Pat. Meanwhile, Ryan had began sleeping with Ava since the day he murdered Kiki and even stopped Ava from killing Griffin at the PCPD.

On New Year's Eve, Ryan murdered film producer Peyton Mills, who was producing a documentary about him, and stashed his body in the balcony of the Metro Court before celebrating the new year with Ava.

On January 21, 2019, Ryan stabs Lulu Spencer-Falconeri in her office after she gets too close to figuring out that he is actually not Kevin. He does not kill her and she gets away due to him suddenly going blind. Lulu is rushed to GH and Ava takes Ryan there too where he is revealed to have been infected with the same virus which had rendered Anna Devane temporarily blind. After his sight is restored, Ryan tries to finish off Lulu in her hospital room, but had to leave when Laura came in. After Lulu says she wants to remember what happened, Ryan convinces Lulu to let him Hypnotize her so she can regain her memory of who tried to kill her. He manipulates her memory to believe that it was Franco stabbed her. Franco is subsequently arrested and charged by the PCPD for Lulu's stabbing and the triple murder

On February 18, Laura discovers Kevin in his cell at Ferncliff, prompting Ryan to drug her from behind and trap her in the basement alongside Kevin, who is still blinded by the virus Ryan had been cured for. On February 20, after asserting his innocence for while, Franco surprisingly pleads guilty to all charges as part of Jordan's secret plan to flush out the real killer. An enraged Ryan then became engaged to Ava despite her doubts and confronted Franco at Ferncliff about why he pled guilty. Franco unwillingly reveals Jordan's plan to him, but Ryan tells him that Jordan is in critical condition after a car accident and then stabs him in the stomach. After revealing his true identity as Ryan the serial killer, Ryan prepared to finish Franco off and stage his death as a self-defensive act, but a nurse arrived and Ryan asked her to get help. As she left, Franco attacked Ryan and escaped the cell before shutting the door on Ryan. However, the nurse returned to free Ryan, who soon put Ferncliff under lock-down. Franco had already escaped the facility and told everyone that Ryan was alive and the killer before being treated for his wound.

On March 1, Ryan and Ava planned to get married and flee to Canada, a plan which was denounced by Mac, Felicia, and Carly. As Ryan went to the basement parking lot of GH to check on his box of drivers' licences in the trunk of his car, Carly appeared behind him, wanting to confront him about Ryan's alias, Todd Wilson, used to identify the patient she talked morse code with long ago (actually Ryan). Ryan knocked Carly unconscious and locked her in the trunk before Felicia confronted him about his engagement to Ava. Ryan shut down Felicia and then drove Ava to a cabin en route to Canada. Unbeknownst to him, Kevin and Laura had escaped from Ferncliff and the latter told everyone that Franco is right about Ryan being alive the killer.

On March 6, once they reached the motel, Ryan and Ava slept together again and showered, but while Ryan was showering, Ava went to look for her shoes in the car and accidentally discovered Carly in the trunk. After a brief encounter with Cameron Spencer, Ryan appeared behind Ava and told her that the gagged up Carly was her wedding present, confusing her to the point that 'Kevin' is having another mental breakdown. Ryan later dumps Carly off at the bottom of a bridge and leaves her to die before returning to the motel and declaring to Ava that he's desperate to marry her.

Ryan and Ava leave the motel and rush over to a nearby crossing bridge leading to Canada, but Ava stops and demands Ryan to call 9-1-1 to ensure Carly's safety. However, Ryan forcefully persuades her into believing that they can run away into a world of paradise and as they leave, Jason arrives and shoots Ryan in the back of the shoulder before telling Ava to move out of the way. Laura arrives moments later and tries to tell Ava that her fiancee is not Kevin but Ryan and that the real Kevin is back at GH. Jason fires a warning shot and threatens to finish Ryan, who tells him that he will never know what happened to Carly if he kills him now. Meanwhile, Ava continues to believe that 'Kevin' is having another nervous breakdown and is told by Ryan to not believe Laura since she wants them to be separated. As police approach their location, Ryan grabs Ava, profoundly declares his love for her, and throws her and himself off the bridge. Jason is able to catch Ava while Ryan falls into the river below to his presumed death. Laura eventually tells Ava the whole truth, leaving her emotionally destroyed, and Jason rescues Carly.

On April 4, Ryan appeared in Ava's nightmare and the day after, Jordan said that the Canadian authorities have discovered Ryan's right hand, which Ryan might have severed off to make everyone believe he is dead. Ava does not believe that Ryan died, and Jordan also thinks this. On April 19, Kevin receives a package from Ryan and inside the package is Ryan's severed right hand.

On May 14, Laura and Curtis came to visit a nurse named April Tremblay in Toronto to ask about Ryan's whereabouts, but she told them nothing and the nurse told a figure (most likely Ryan) that they were gone and the figure stabbed an Invader article depicting the publicity of Kevin and Ava's 'romance' back in PC. On May 15, Ryan killed April after she told Curtis and Laura to come to her cabin quickly, and then ambushed the two when they discovered April's corpse. Ryan then tied Curtis and Laura up in chairs and left them to die in the cabin he rigged with explosives, but they were able to escape before it blew up. On May 21, Ryan returned to PC and knocked out Kevin backstage as Ava was performing at the Nurse's Ball. Ryan, pretending to be Kevin again, came across Scott while rushing to the stage and then knocked him out when Scott found out he's Ryan after he accidentally pulled off his fake hand. Ryan then left Kevin hanging from the roof of the stage for the guests to see and followed Ava to her new compound. Rya pulls out a knife and Ava is able to convince him that she still loves him, and that Kevin could never replace what they had. She tells him that she wants to runa away with him, and then she pulls out her gun. Ryan says that she wont kill him, and she shoots the gun around him a few times. Ava and Ryan both dont know that Ryan needs to stay alive because his kidney is needed for Jordan who is in desparate need of one due to her accident. Curtis shows up right before Ava can finsh Ryan off he is able to convince Ava to put the gun down. Chase shows up and Curtis tells him to stand down. As Ryan is getting arrested he says to Ava "You couldn't pull the trigger; you love me." This infuriates Ava and she grabs his knife and stabs him in the back.

Ryan is brought to GH and is treated for his stab wound. He makes it out of surgery and he is also a match to donate his kidney to Jordan Ashford. At first, he tells Curtis to clear his name and not have him sent to prison, but that wont happen. Curtis tries to talk to him and that also doesn't work, but after Franco injects him with a substance which made him briefly convulse, Stella is able to convince him on June 4. He signs the forms after Finn tells him he will treated with equal care while under the knife and Stella tells him she will speak for him at his sentencing. On June 6, Ryan fell into a coma after he had the surgery to have his kidney removed.

• Killed Marsha Cooper [prior to 1992; revealed 1998; on Port Charles]
• Killed his abusive mother [prior to 1992; revealed 1995]
• Killed his fiancée, Linda Walker [prior to 1992]
• Killed Suzzane Smith [prior to 1992]
• Killed Deborah Jones by stabbing her to death [prior to 1992]
• Killed Helen Parks by stabbing her to death [prior to 1992]
• Killed Magi Anthony by stabbing her to death [prior to 1992]
• Killed his wife, Gloria Wilson [1992]
• Stalked Felicia Scorpio [May 1992-Apr 1995]
• Killed Michelle Blake [Mar 24, 1993]
• Killed Jessica Holmes [Sep 3, 1993]
• Attacked Audrey Hardy after mistaking her for his abusive mother [May 28, 1993]
• Attacked Steve Hardy and attempted to kill him [May 28, 1993]
• Kidnapped Maxie Jones [Jun 1993]
• Kidnapped Felicia and attempted to murder her [1993]
• Had Felicia committed to an asylum [1993; she later escaped with Mac]
• Attempted to murder Felicia again [1994]
• Held Felicia hostage at gunpoint during her wedding to Mac [1994]
• Bombed the wedding ceremony after fighting with Mac [1994]
• Killed his counselor Connie Cooper after she helped him escape an asylum [Mar 1995]
• Kidnapped Georgie Jones [Mar 1995]
• Fought with his brother, Kevin Collins [Mar 24, 1995]

• Attacked Kevin after escaping from his restraints and held him captive at Ferncliff while impersonating him [Aug 28, 2018-Mar 4, 2019]
• Murdered Mary Pat Ingles by stabbing her to death and then decapitated her postmortem [Oct 30, 2018; revealed Nov 1, 2018]
• Attempted to frame Carly Corinthos for Mary Pat's murder [Nov 1, 2018]
• Murdered Kiki Jerome by stabbing her to death [Nov 26, 2018; revealed Nov 28, 2018]
• Framed Dr. Griffin Munro for Kiki's murder [Nov 29-Dec 6, 2018]
• Lying to a police official; withheld the information that Ava was about to shoot Griffin [Dec 3, 2018]
• Lying to police officials again; lied about having spent the night with Ava [Dec 4, 2018]
• Murdered Peyton Mills by stabbing him to death [Dec 31, 2018; shown Dec 27-28, 2018]
• Stabbed Lulu Spencer-Falconeri in the stomach [Jan 21, 2019]
• Attempted to smother Lulu to death at the hospital [Jan 28, 2019]
• Tricked Lulu into believing that Franco stabbed her and framed Franco for the stabbing and as well as his murders [Feb 5-Mar 5, 2019]
• Injected Laura Collins with a sedative and rendered her unconscious [Feb 18, 2019]
• Held Kevin and Laura hostage in the Ferncliff basement [Feb 20-Mar 4, 2019]
• Stabbed Franco in the stomach and attempted to make it look like a self-defensive act [Feb 27, 2019]
• Knocked Carly Corinthos unconscious and held her captive in the trunk of a car [Mar 4-7, 2019]
• Dumped Carly at the bottom of a bridge and left her to die [Mar 7-11, 2019; she was saved by Jason Morgan]
• Attempted to flee to Canada [Mar 8, 2019]
• Tossed himself and Ava Jerome off a bridge to avoid police capture [Mar 8, 2019; Ava was caught by Jason while Ryan fell into the river to his presumed death]
• Faked his death with the help of a nurse named April Tremblay [Mar 8-May 15, 2019; revealed on May 14, 2019]
• Delivered his severed right hand to Kevin [Apr 19, 2019]
• Murdered April Tremblay by stabbing her in the chest [May 15, 2019]
• Knocked Curtis Ashford unconscious [May 15, 2019]
• Attacked Laura [May 15, 2019]
• Held Curtis and Laura hostage in a cabin he rigged with explosives [May 15-17, 2019; revealed May 17, 2019; they escaped]
• Knocked Kevin unconscious and left him hanging from the roof of the Nurse's Ball stage [May 21-22, 2019]
• Knocked Scott Baldwin unconscious [May 22, 2019]
• Threatened Ava with a knife [May 23, 2019]