“I may have killed him” former FBI agent tells 911 after attack on son-in-law

Listen as a 911 dispatcher in Davidson County, N.C., directs Tom Martens and his daughter Molly Corbett how to perform CPR after Martens called for help the night of Aug. 2, 2015. Martens says he had to intervene in self-defense after his son-in-law Jason Corbett got into fight with his daughter. Source