Traumatized: US boxer shot dead in front of his 3 children

US boxer Danny Kelly Jr. was gunned down in front of his family in a Christmas Eve shooting which may stem from a road rage incident, according to police in Maryland.

Kelly, 30, was traveling with his girlfriend and three children to a holiday gathering in the nearby Temple Hills area of Prince George's County on Friday when a vehicle pulled up alongside his SUV and a person inside opened fire.