'Young and the Restless' Star Kristoff St. John Dead at 52

Kristoff St. John has died at age 52, PEOPLE confirms.

TMZ first reported that the Young and the Restless star was found dead Sunday after one of his friends went to check on him at his home in the San Fernando Valley. Police and paramedics were alerted and responded to the house, where the actor was pronounced dead on the scene.

According to TMZ, there was no sign of foul play.

St. John’s lawyer Mark Geragos tweeted a statement, writing: “Few men had the unique strength, courage & sensitivity that @kristoffstjohn1 lived every single minute of every day. He impacted everyone he met and millions who he inspired and in turn admired him. On behalf of @MiaStJohnBoxer & @TheStJohnFamily thank you for all of your love.”

The Los Angeles Police Department confirmed to PEOPLE that a death investigation took place at around 2:05 p.m. on Sunday for a possible alcohol overdose at the 2300 block of Morea Way.

The Los Angeles County Medical Examiner-Coroner confirmed to PEOPLE that St. John was found dead at a home in Woodland Hills and was pronounced deceased at 4:02 p.m. An autopsy is scheduled for Monday.

CBS Television Network and Sony Pictures Television released a joint statement: “The news of Kristoff St. John’s passing is heartbreaking. He was a very talented actor and an even better person. 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. On behalf of the Y&R cast and crew, CBS and Sony Pictures Television, we offer our heartfelt sympathy to his family and loved ones, especially his two daughters, Paris and Lola.”

St. John’s son Julian with ex-wife Mia St. John died by suicide in 2014 at the age of 24. Mia went on to found the El Saber es Poder (Knowledge is Power) Foundation to battle mental illness.

In 2017, St. John, who has played Neil Winters on CBS’ The Young and the Restless since 1991, underwent psychiatric treatment after a reported scare regarding his mental health. According to TMZ, he threatened to kill himself with a gun and was placed under a 72-hour hold for psychiatric evaluation.

In a statement to Entertainment Tonight at the time, Mia blasted reports about the incident that led her ex to seek help.

“I want the world to know the truth about what is happening with Kristoff, because currently there is inaccurate, and fabricated information being reported by certain online outlets,” she said. “No parent should ever have to bury their child, and for those who do, it is a nightmare that haunts you forever. The death of our beloved son Julian has taken a toll on both of us. He is an actor and while he may appear whole on the outside, his heart is broken. As a society, we need to start taking mental health seriously and realize that no one is immune.”

St. John also shares daughter Paris with Mia, as well as daughter Lola with ex-wife Allana Nadal.

In September 2018, St. John announced his engagement to model Kseniya Mikhaleva.

Mikhaleva addressed his death early Monday morning, writing “So early…so early” on her Instagram Story with crying and heart emojis. “Why are you leave so early?” she wrote. “Why…you are always in my heart.”

She also posted a photo of the couple.

“How did it happen ??? How ??? Why did you leave so early ???? and left me alone ….. I can’t believe,” she captioned the post. “You were everything to me …. you were a loving father, a loving man …..how.”

Mia, 51, also addressed the news in a since-deleted tweet obtained by TMZ, writing: “THAT HOSPITAL KILLED OUR SON @TheArtofJulian THEN MY HUSBAND @kristoffstjohn1 THATS WHAT HAPPENED! THEY KILLED MY FAMILY.”

St. John’s last activity on Twitter was on Jan. 21, when he retweeted a tweet about losing a child that reads, “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.”