High Crimes (2002)

High powered lawyer Claire Kubik finds her world turned upside down when her husband, who she thought was Tom Kubik, is arrested and is revealed to be Ron Chapman. Chapman is on trial for a murder of Latin American villagers while he was in the Marines. Claire soon learns that to navigate the military justice system, she'll need help from the somewhat unconventional Charlie Grimes; meanwhile, Claire's sister, Jackie, is falling in love with wet-behind-the-ears Lieutenant Embry assigned as the official defense lawyer. And most of the eyewitnesses have rather too conveniently died.