Gilchrist jumped the route as journeyman Hill tried to force a pass to Kenny Britt on second-and-goal from the 4. The Rams Hill had beaten Gilchrist on a 7-yard TD pass to Stedman Bailey with 2:04 left that pulled the Rams within three points.
Ryan Mathews had a 32-yard touchdown run and linebacker Andrew Gachkar scored on a 13-yard fumble recovery 21 seconds later to help the Chargers (7-4) tighten the AFC West race.
Philip Rivers shook off a 99-yard interception return for a touchdown by Janoris Jenkins and threw a 29-yard touchdown pass in the fourth quarter to Keenan Allen, who earlier had two turnovers.
