A Gwinnett County man will spend the rest of his life in prison for killing his mistress with his wife's gun, the county district attorney's office announced.

Rickey Williams was found guilty of aggravated assault and felony murder on Thursday after a three-day trial.

Williams had been “having an affair” with Lynette Karim in the summer of 2015, multiple witnesses testified in the trial. On the night of July 3, 2015, the two were seen arguing in the parking lot of Highland Lakes Apartments in Peachtree Corners. Karim was in her SUV and Williams was standing outside the car during the argument.

As the argument escalated, Williams repeatedly punched Karim through the open driver’s side window, the DA’s office said. Williams then called his wife, who is not named in the DA’s release, and asked her to bring him her gun, the release said. A video played in court showed Williams asking for “the ‘thing,’” referencing his wife’s gun, the release said.

After Williams got the gun, he shot Karim, killing her, witnesses testified.

Williams’ wife was not charged with a crime because Williams “may have lead her to believe his life was actually in danger,” necessitating the gun for protection, said Assistant District Attorney Robby King.

Williams was sentenced to life in prison after the guilty verdict was returned Thursday. He has apologized to Karim’s family.

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