Stone began dating Robin Scorpio despite her uncle Mac's warnings for them to stay away from each other. When Stone became very sick with the flu, Robin took care of him. After Stone assured Robin that he had been tested and was HIV negative, the two made love. After Robin told Mac what had happened, Mac was furious with both Robin and Stone. But he also decided that he needed to let Robin grow up. Stone still had the flu and could not get rid of it. He was then tested for HIV again and the test came out positive. Stone was devastated and couldn't bring himself to tell Robin.
When a hit was put out on Sonny, Luke, Brenda, Robin, and Stone, Stone was shot and his blood got on Robin's hands. He tried to wipe it off then he ran off. Robin found him in a motel, the same motel where the two had first made love. Stone then told Robin the terrible news that he had tested HIV positive, because one of his previous girlfriends, Crystal, had been a drug addict. Dr. Alan Quartermaine ordered both Robin and Stone tested. Robin tested negative, but Stone's test revealed he had AIDS. Alan started Stone on drug therapy. Afraid of infecting Robin, Stone refused to sleep with her again. When Mac found out that Stone had AIDS, he was furious at first, and afraid for Robin. But he came to care for Stone. Robin then got very sick with the flu and tested HIV positive. Brenda, Robin's best friend, took the news hard and broke down.
As Stone continued to grow more ill, his eyesight started to fail. But the day of his death, he told Robin to go stand near the light of the window. His eyes slowly came into focus, and Stone saw Robin one last time before he died. Sonny was devastated, since Stone was like his little brother. Brenda also broke down again and was comforted by Sonny. Stone's memorial was held at Sonny's penthouse. Later, Robin, Sonny, and Brenda had Stone cremated and they dropped his ashes off the bridge into the water. Robin then remembered when Stone went bungee jumping off the same bridge.
On September 29, 2010, Lisa Niles traps Robin in a well. While hallucinating, Robin sees her old love Stone who helps her survive her ordeal.