Other contributing factors included "myocardial bridging of left anterior descending coronary artery and the effects of ethanol".
The beloved soap star, who spent almost three decades on daytime TV, was declared dead on February 3 after first responders were called to his Woodland Hills, Calif., home for a possible alcohol overdose.
Kristoff St. John's cause of death was accidental from a combination of alcohol abuse and heart disease.
The 52-year-old has played Neil Winters on the soap opera since 1991, earning him multiple Daytime Emmy Award nominations and several NAACP Image Awards. The report also says Kristoff was discharged from a mental health facility two days before his death, and that he was admitted after threatening to hurt himself.
"No parent should ever have to bury their child, and for those who do, it is a nightmare that haunts you forever". The cause was ruled accidental, TMZ reports, because Kristoff was allegedly binging on alcohol when he died. Kristoff's son Julian tragically committed suicide in 2014. "He is an actor and while he may appear whole on the outside, his heart is broken", she told Entertainment Tonight at the time.
St. John is survived by his daughter Paris Nicole, whom he shared with Mia St. John.
Kristoff St. John, she said, was disoriented, saying things like, "He didn't want to be here anymore", and claiming he could see their late son Julian.
He had become engaged to model Kseniya Mikhaleva in September.