There was no official cause of death, but Young's manager, Paul Baruch, said the actor "tragically took his own life."
"Lee was more than just a brilliant young actor, he was a wonderful and gentle soul who will be truly missed. We ask that you please respect the privacy of his family and friends as this very difficult time," Baruch said in a statement.
Young's body was found at his North Hollywood home by police Monday morning after he failed to show up for work on TNT's crime drama "Rizzoli & Isles," police Officer Sally Madera said. The Los Angeles Fire Department was summoned and pronounced him dead at the scene, she said.
LAPD robbery-homicide detectives and the Los Angeles County coroner office were investigating because it is a high-profile death, she said. Madera had no details about the cause of death.
In the TNT series, Young played Barry Frost, a computer savvy -- but squeamish-- police detective.
Earlier Monday, the channel announced it was renewing the series that stars Angie Harmon and Sasha Alexander.
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