On October 25, 2017, Soap Opera Digest confirmed that Braun would be returning to GH as a new character, debuting on November 22. On November 17, it was revealed that she will be portraying Kim Nero, Oscar's mom.
She made her first appearance on November 22, 2017.
On May 22, 2019 Soaps.com announced that Tamara Braun (along with Billy Miller) will temporarily be leaving GH during the week of May 27-31 as their characters go to Kilimanjaro to spread the ashes of their son Oscar. They were last seen on May 16, 2019 and made appearances on May 28 on June 4 and again on June 12 before returning on June 17, 2019.
She is first seen at the Corinthos house for Thanksgiving with her son Oscar.
In 2018, it's revealed that his son Oscar is dying of an inoperable Grade IV Glioblastoma and it is growing rapidly (Kim knew and didn't tell him).
On New Years Eve, 2018, Kim kisses Drew Cain. This did not go much further, as Kim is committed to her relationship with Julian.
On March 22, 2019, Terry told Oscar and parents that he has 6 weeks to a month left to live but on April 4, Oscar has a severe seizure that caused him to fall on the bridge and rushed to General Hospital where parents and Josslyn get news he's in a coma and Terry said if he wakes up he won't the same again.
On April 29, (shown on May 1), Kim's son Oscar died in his sleep.
On June 4, Kim and Drew planned to pour their son Oscar ashes on mountain Kilimanjaro.
On June 12, while staying in the vacation cabin Kim fainted and was starting to hallucinate about her son Oscar and thought Drew was their son Oscar which Drew plays along and possibly revealed that she is pregnant with Julian's child as she told "Oscar" about "his little brother or sister" but she finally gets better soon after.
On June 18, Kim returns home from mountain Kilimanjaro and it turns out Kim Is not really pregnant she just hallucinating and want a baby so she told Julian to give her a baby but he turns her down by saying Oscar is gone and no baby is going to replace him. Kim invites Drew to her apartment and she kisses him and she and she proposes that they have a baby together. He tells her no and she tries to convince him and still refuses the offer. Drew leaves and Kim calls Shiloh to help her convince Drew to want to have a baby with her. Julian interrupts the conversation and he tells Kim why she needs to stay away from Shiloh.
On July 8, Kim cuts the power to the Haunted Star at Franco and Elizabeth's wedding reception, gets Drew alone, and injects him with a sedative. She then takes him to a nearby bedroom and begins to undress him while undressing herself as well. Before she can have sex with Drew, Kim is stopped by Julian and he helps comfort her about Oscar never being able to be recreated. Meanwhile, after waking up, Drew decides not to press any charges against Kim.
On August 14, Kim ran into Franco at the hospital who started talking about her past with Drew in 1st person as if he lived in those moments with her and he kissed her with Elizabeth and the real Drew watching. Kim was shocked and wanted answers about what was going on. She soon learned that Franco has Drew's memories from a procedure done by Dr. Arthur Cabot. She becomes conflicted over her feelings over Julian and "Drew".