The "Green Room" star was found dead early Sunday morning, according to TMZ, after suffering a freak car accident at his home in the San Fernando Valley.
The actor came onto the scene with high-profile roles in such films as "Charlie Bartlett" and "Alpha Dog."
Yelchin played the navigator of the Starship Enterprise, Ensign Pavel Chekov, in director J.J. Abrams' first two "Trek" films: 2009's "Star Trek" and 2013's "Star Trek Into Darkness."
One of Yelchin's last films will be this summer's "Star Trek Beyond," which opens July 22.
A surprise attack in outer space forces the Enterprise to crash-land on a mysterious world. The assault came from Krall (Idris Elba), a lizard-like dictator who derives his energy by sucking the life out of his victims. Krall needs an ancient and valuable artifact that's aboard the badly damaged starship. Left stranded in a rugged wilderness, Kirk (Chris Pine), Spock (Zachary Quinto) and the rest of the crew must now battle a deadly alien race while trying to find a way off their hostile planet. Read More