Zachary Quinto says Anton Yelchin's death is a "devastating loss".
The 27-year-old actor died from "blunt traumatic asphyxia" in a freak accident at his Los Angeles home last month when his car rolled backward and trapped him against his gate and his 'Star Trek' co-star Zachary, 39, admitted the entire cast are still in shock over his death.
Speaking during an appearance on 'The Late Show With Stephen Colbert', he said: "Beautiful, beautiful guy. I don't even know how to talk about it. We already knew this was going to be a bittersweet experience as a result of the loss of Leonard [Nimoy, who died in February 2015]. But this has been absolutely devastating for all of us. I think our goal just has to be to celebrate his incredible life and honour him. It was a terrible loss, not only to us but to audiences and the industry."
Anton was mourned at a private service by close friends and family and buried in an "undisclosed location" five days after his death at his home in Studio City, California.
On the night he died, Anton was due at rehearsals but when he failed to show up, his worried friends went to his home to check on him and found his lifeless body.
The tragic death was officially ruled an accident, however questions were raised over why the vehicle rolled back and whether it was a mechanical or human error.
An investigation is also being held into whether Anton's car was a model that should have been recalled because of a gear-shifting problem.
Zachary previously penned a touching message on Instagram, describing Anton as "enormously talented and generous of heart".
He wrote: "our dear friend. our comrade. our anton. one of the most open and intellectually curious people i have ever had the pleasure to know. so enormously talented and generous of heart. wise beyond his years. and gone before his time. all love and strength to his family at this impossible time of grief (sic)"