Alec Baldwin on Friday expressed “shock and sadness” over an incident on the set of his film, Rust, where a gun he was handling misfired, killing the cinematographer and injuring the director.

Director of photography Halyna Hutchins, 42, died after being injured Thursday when the prop gun was discharged by Baldwin, the $6 million-budgeted Western’s producer and star. Hutchins had been transported by helicopter to the University of New Mexico Hospital, where she was pronounced dead, according to the Santa Fe County Sheriff’s Office.

“There are no words to convey my shock and sadness regarding the tragic accident that took the life of Halyna Hutchins, a wife, mother and deeply admired colleague of ours. I’m fully cooperating with the police investigation to address how this tragedy occurred,” Baldwin said via Twitter. “I am in touch with her husband, offering my support to him and his family. My heart is broken for her husband, their son, and all who knew and loved Halyna.”