Jack Vaughn

Jack Vaughan is the father of a kidnapping victim in the Season Three episode 3rd Life.

Background
Little is known about Jack's past, other than he appears to have possibly been a hitman with the mob. He and is his daughter were in the witness protection program, under the protection of U.S. Marshall Pat Mannan. This information is unknown to the BAU at the beginning. It is only later discovered that Pat is a U.S. Marshall when Morgan sees a gun on Pat while he is struggling to restrain Jack.

It is revealed that Pat knows where the suspects may be hiding and asks Jack if he is still up tp doing what he "used to do". Jack then disappears and meets up with one of kidnappers, shooting him in the leg with a shotgun. After questioning the injured young man, Jack is told the location of Lyndsey and her kidnapper.

Meanwhile, Reid ascertains the location himself and rushes to meet the rest of the team there. When he arrives, he sees Jack holding Ryan Phillips at gunpoint as his daughter looks on. Reid tries to get Jack to drop the shotgun, but Lyndsey begs her father to kill Ryan. Jack agrees that he needs to make changes in his life to make a better life for his daughter...tomorrow. He pulls the trigger, killing Ryan.

The rest of the team arrives with Pat Mannan, and they reason that what happens to Jack depends on how important of a witness he is. Jack is later seen living a new life with his daughter in a completely new town. He and Lyndsey meet a pair of neighbors, a father and his daughter. The two men shake hands anf Lyndsey introduces her self as "Katie".