Bound by Blood (2007)

Johnny (Sean Eichenberg), a policeman, plays by the rules, while his childhood friend Trevor (Chris Cones), a kickboxer with an attitude, is the opposite. The only thing they still have in common is one woman, Lauren, who is Trevor's wife and Johnny's sister. When she's gunned down by mobsters, Johnny and Trevor come to blows. The two set off to find the killers but follow their own paths, one seeking justice, the other, pure vengeance.