Former Disney star and TNT show Rizzoli & Isles actor Lee Thompson Young apparently committed suicide by shooting himself.

He was found dead by his landlord at his North Hollywood home when Young failed to report for the shooting of Rizzoli & Isles, and his landlord went to check on him.

Though it is unclear as to why the 29-year-old actor may have wanted to kill himself, the news of his death has sent shock waves around Hollywood world and many celebrities have taken to Twitter to express their grief.

Actress and former model Gabrielle Union wrote: "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."

Jackée Harry @JackeeHarry: "My Thoughts & Prayers Go Out To The Family And Friends Of Lee Thompson Young."

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."

solange knowles @solangeknowles: "Very very sad to hear about Lee Thompson Young. He was always very kind, and such a light."

Harry Shum Jr.: "Feeling incredibly sad about Lee Thompson Young. My heart goes out to his family and friends. #gonetoosoon."

Columbus Short@ColumbusShort1: My heart is broken today. RIP to my dear friend and brother Lee Thompson Young. Writing partner/Friend/Brother #HeartAche

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."

Michael Ealy @MichaelEaly : "SAD SAD NEWS. RIP Lee Thompson Young. 29 and so much promise. Lift up his family today. Stunned right now."

Following the actor's death TNT, studio Warner Bros. and series producer Janet Tamaro in a joint statement said: "Everyone at [the show] is devastated by the news of the passing of Lee Thompson Young. We are beyond heartbroken at the loss of this sweet, gentle, good-hearted, intelligent man. He was truly a member of our family. Lee will be cherished and remembered by all who knew and loved him, both on- and offscreen, for his positive energy, infectious smile and soulful grace".

READ: Lee Thompson Young Dead: Former Disney Star 'Committed Suicide'