Actor Kristoff St. John has died, his attorney confirmed Monday morning to CBS News. St. John played Neil Winters on CBS' "The Young and the Restless." He was 52.

St. John was found dead Sunday at his home in Los Angeles, the county medical examiner's office said, located in the Woodland Hills area, according to CBS Los Angeles.

An autopsy was performed Monday, the medical examiner's office said. The office said it would defer on listing a cause of death.

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St. John joined the cast of "The Young and the Restless" in 1991. He won Daytime Emmy Awards in 1992 and 2008 for his work on the show, and he was nominated seven other times for playing Winters.

In 2015, St. John spoke with "Entertainment Tonight" about the death of his 24-year-old son Julian St. John. The younger St. John died by suicide in his room at a mental health facility.

"That call was the worst call I've ever had in my life," Kristoff St. John told ET. He and his ex-wife settled a wrongful death lawsuit against the facility out of court.

The last tweet posted to Kristoff St. John's account was a retweet that said, "Grieving the loss of a child is a process. It begins on the day your child passes, and ends the day the parent joins them."

St. John's fiancee, model Kseniya Mikhaleva, reacted to his death on Instagram. "You were everything to me .... you were a loving father, a loving man," she said.

The post was later removed from her account. In December, the couple posted to their respective accounts a picture of Mikhaleva kissing St. John's cheek.

In a statement, CBS and Sony Pictures Television, which produces "The Young and the Restless," called St. John's death "heartbreaking." "He was a very talented actor and an even better person," the statement said. "For those of us who were fortunate enough to work with him on 'The Young and the Restless' for the last 27 years, he was a beloved friend whose smile and infectious laugh made every day on set a joy and made audiences love him."

St. John is survived by his two daughters Paris and Lola.