It has been confirmed by TNT and by the actor's publicist:
Lee Thompson Young took his own life today at the age of 29.
The rising television star, who had helped anchor Rizzoli & Isles for the past three years, got his start in 1998 on The Famous Jett Jackson and also appeared on episodes of such hits as Smallville and Scrubs.
Below, a number of celebrities mourn Young's death via Twitter:
Gabrielle Union: "I had the pleasure of working w/ #LeeThompsonYoung on Flash Forward & he was an extremely talented beautiful soul. My thoughts & prayers are with his loved ones. #RIP."
Tia Mowry: "My heart goes out to Lee Thompson Young. RIP. These child stars are leaving us too soon! My heart is aching..."
Donald Faison: "This breaks my heart. RIP Lee Thompson Young."
Harry Shum Jr.: "Feeling incredibly sad about Lee Thompson Young. My heart goes out to his family and friends. #gonetoosoon."
Amber Riley: "Man...RIP #LeeThompsonYoung #Jett Jackson...Everything that glitters isn't gold. You just never know, that just tore me up a little. Man..."
Jenna Ushkowitz: "My deepest thoughts and love to the friends and family who knew Lee Thompson Young."
Wes Craven: "My sympathy to the family of Lee Thompson Young and to all those who knew and loved him...I had the pleasure of working with him in 2007 on Hills Have Eyes 2. He was a pro, gifted and warm. The tragedy of this kind of loss is particularly bewildering and painful."
Solange Knowles: "Very very sad to hear about Lee Thompson Young. He was always very kind, and such a light."
Eric McCormack: "So sad to hear about Lee Thompson Young. My condolences to his family & the cast & crew of #rizzoliandisles."