The investigation into exactly what happened on the set of the film Rust that led to a cinematographer's death is heating up. On Thursday, a search warrant was issued for actor Alec Baldwin’s cellphone. According to an affidavit filed in Santa Fe Magistrate Court, authorities asked for the iPhone in order to examine conversations between Alec Baldwin and a violent crimes detective with the Santa Fe County Sheriff's Office. The new development comes just weeks after Alec Baldwin's widely viewed ABC interview in which he said he never pulled the trigger. Baldwin claims that he was holding the Colt .45...