NCIS Season 6 Episode 10

Boatsman's mate Petty Officer Greg Collins dies from wounds incurred in a road accident, which was caused by an inaccurate shooter. However he's also covered in slightly older injuries, bandaged by the same man: Sam Bennett. Sam is furious at the shooter, they were mates and both in an illegal 'fight club'. Greg's car was chased and crashed by a sports car traced to Dale Kapp, jet set multimillion heiress Tabitha Summers's lawyer and fourth husband. He is found beaten to death as well, and involved in a surprising line of crime.