Luke is Meg's jailbird boyfriend. He appears in the season 8 episode "Dial Meg for Murder". He is in prison for robbing a grocery store, and not expected to get out for another four years. In "Dial Meg For Murder", Luke escapes from prison and goes to the Griffin house to hide until he is caught by Joe. Meg also goes to jail for aiding him after he escaped from prison.
FG811 "Dial Meg For Murder"