Watch Becky Watts Killed for Kicks for Free: How to Stream the Movie Online at 123Movies. . The story behind the murder of 16-year-old Becky Watts, who was killed by her stepbrother Nathan Matthews and his 21-year-old partner Shauna Hoare in Bristol in February 2015. This programme documents the huge police manhunt that unfolded in the wake of her disappearance, and the police investigation which eventually brought her murderous stepbrother to justice.