The husband of "Rust" cinematographer Halyna Hutchins has lawyered up, and is preparing to file a wrongful death lawsuit ... TMZ has learned. Matthew Hutchins retained the services of Panish | Shea | Boyle | Ravipudi ... according to the L.A.-based law firm. The firm's website says its attorneys specialize in personal injury and wrongful death litigation ... so clearly, Halyna's tragic death is in their wheelhouse. Sources familiar with the situation tell us the lawsuit will be filed on behalf of Halyna's spouse and their child, and there will be multiple defendants.