|Out of universe information|
Unwilling to leave his home, he chose to betray the Balarian "outsiders" to the Wraith in 2008. He armed himself and formed a mob that searched the village for Balarians. He gave a large group of them over to the Wraith and was subsequently jailed for his actions. When Dr. Carson Beckett and Dr. Rodney McKay were captured, Lt. Colonel John Sheppard accused him, but Jervis wasn't responsible. He also said he wouldn't have betrayed Beckett as Beckett was so good to them. He remained there until a visit from Elson, who led him to believe he had had a change of heart and freed him from his cell.
Jervis then led a large group of Wraith from the Stargate to the nearby mines where he believed the remainder of the Balarians were hiding. Instead, he found a trap that had been laid by Elson and Sheppard's team. He, along with many Wraith and members of his village mob, died in the underground explosion triggered by Sheppard. (SGA: "Outsiders")