A 62-year-old man who stopped to help a couple on the side of the road Thursday evening in Southeast Bexar County ended up shooting the man he was trying to help after he was allegedly attacked, Bexar County deputies said.

A 31-year-old man and his wife had been traveling on FM 78 around 7 p.m. when their truck ran out of gas at Firestone Parkway, and the older man pulled over to help, deputies said. A dispute arose between the two men over how the husband was addressing his wife. Investigators believe the older man was assaulted before he fired his gun, likely in self defense, said Sgt. Blake Johnson with the Bexar County Sheriff's Office.