Who is Jamie McDonald from Mercy and what is their importance?

Jamie McDonald is Cam's cousin. Jamie does not live in Wheelock, but a neighboring town. However, when Jamie's wife, Maggie, asks him to kill her because of the pain of her incurable cancer, Jamie takes her to Wheelock in order to commit the act. Jamie believes that going to Wheelock is important, because it is the home of the remaining Wheelock clan and it is where Cam, the clan chief, is the police chief. Jamie takes Maggie to the Wheelock Inn, spends the night with her, and then smothers her with a pillow in the morning. After spending some time mourning his wife, Jamie puts her in his truck and drives to the Wheelock police station.