Colin

Colin is the father of Smurf's two eldest children, Andrew and Julia Cody.

Early Life
Colin and his brother, Jed, grew up with an abusive father.

Colin was also in Vietnam at some point and developed PTSD as a result of his time there, leaving him violent and unpredictable.

Season 4
Colin appears in a series of flashbacks to 1977 featuring a young Smurf. Initially at odds with each other, the two fall in love and Smurf falls pregnant. However, during a shootout with the cops, Colin is hit in the leg and quickly bleeds to death, devastating Smurf. Smurf and Jed bury Colin's body and his car in a field on Jed's land shortly before Smurf gives birth to Julia and Andrew.

In the present, Smurf takes Pope to Jed's home where she brings him to Colin's grave and reveals that his father is buried there just before killing Jed in a suicide mission. Previously, Pope knew nothing about his father's side of the family, not even what he looked like as Smurf didn't have any pictures of Colin.

At Smurf's funeral, Billy tells Pope that Smurf had loved him because he came from Colin, the one man that Smurf truly loved and who never had the chance to disappoint her. Billy implies that Pope's mental illness was likely something that he inherited from Colin who Billy has heard was "a crazy son of a bitch."

Trivia

 * Young Colin is played by Grant Harvey in season 4.