A gunman in the Wednesday killing of five people in South Carolina was former NFL player Phillip Adams, a source told the Associated Press.

A doctor, his wife their two young grandchildren were among those found Wednesday evening at a home in York County, South Carolina. They died as a result of gunshot wounds, according to .

Adams’ parents live near the doctor’s home, and he has been treated by the doctor in the past, according to the AP’s source, who spoke on condition of anonymity because he wasn’t authorized to speak publicly. The source said Adams killed himself after midnight Thursday.

Adams was a defensive back for teams including the San Francisco 49ers and the Atlanta Falcons.