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 Sean Cavanaugh was the former lieutenant of Boston Police Department's Homicide. He is old friends with Vincent Korsak.

History[]

Little is known about Sean's past, but it is mentioned by Korsak that when he and Sean were rookies, Sean's wife and son died in an explosion. (It is later learned that this was caused by Patrick "Paddy" Doyle (Maura's biological father), in an attempt to kill Sean to stop him from investigating the drug deals of an Colombian drug cartel.

According to Korsak, Sean didn't have any close relationships with other women after the death of his wife. He has a daughter but not much contact with her. He was never married to his daughter's mother.

Season One[]

In Season 1 Episode 7 "Born to Run" Cavanaugh mentions that the suspect is his daughter's age.

Season Two[]

Season Three[]

Sean dated Angela Rizzoli (Jane's mother), creating a strain between him and the Rizzoli children.

Season Four[]

Sean planned to kill Paddy Doyle in the Court House, after learning that Doyle had been responsible for the murders of Sean's wife and son. He was talked out of his plans by Maura, who says that the knowledge of being placed in prison by his true love Hope will be much harder for Doyle to bear than being killed by Sean.

Season Five[]

Angela and Sean broke up later that season.

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