LAS VEGAS — Police in Las Vegas said Monday they’re investigating allegations that a fan in the stands struck Cardinals quarterback Kyler Murray amid celebrations of Arizona’s 29-23 overtime victory over the Raiders.

Murray was high-fiving front-row spectators at Allegiant Stadium following Byron Murphy Jr.’s game-ending fumble return on Sunday when a man appeared to reach out and smack Murray in the face with an open hand.

Video showed Murray appearing stunned, but not injured, then attempting to identify the alleged attacker in the mostly happy crowd.

Officer Larry Hadfield, a Las Vegas police spokesman, confirmed that a battery complaint was made around 6:30 p.m. at the stadium. The report was not immediately available.

Hadfield did not name Murray as the reporting person but confirmed the allegation was that “a spectator at the stadium struck a professional football player.”

Hadfield said a suspect was not immediately identified and an investigation was ongoing.

Cardinals head coach Kliff Kingsbury said Monday that he hadn’t seen the video of the alleged altercation.

“I was just told about it,” he said. “But I think that guy’s a lowlife, whoever did it, and I hope they arrest him, he gets fired and can never go to another game.”

Cardinals spokesman Mark Dalton referred any questions about the incident to Las Vegas police. The Raiders said they were aware of the incident and are cooperating with Las Vegas police.

Murray had an outstanding game, leading the Cardinals (1-1) to two touchdowns and two 2-point conversions in the final 8 minutes, 13 seconds of regulation to force overtime.

The victory was Arizona’s first since Murray agreed to a $230.5 million, five-year contract extension. He was the No. 1 overall pick in the 2019 NFL draft after winning the Heisman Trophy at Oklahoma in 2018.

ESPN’s Josh Weinfuss and Paul Gutierrez and The Associated Press contributed to this report.