Alec Baldwin says his "heart is broken" for the family of cinematographer Halyna Hutchins, who was shot dead on the set of his latest movie.
He's tweeted to say there are "no words to convey my shock and sadness".
She was killed when he fired a prop gun during filming in New Mexico.
The movie's director was also injured - he's since left hospital.
Alec added that he's fully cooperating with the police investigation, and has been in touch with Halyna's husband to offer support.
