A retired California police chief was deliberately mowed down and killed while riding his bike in Las Vegas by a laughing teenage driver whose pal can be heard saying “Yeah, hit his ass,” video of the incident shows.

Andreas Probst, 64, was killed after he was deliberately struck while out for a morning bike ride around 6 a.m. on Aug. 14, according to Las Vegas police.

The unidentified 17-year-old driver of the Hyundai was soon arrested by police soon afterward, The Las Vegas Review-Journal reported.

The teen has since been charged with murder, after police discovered a video posted to social media that allegedly showed him deliberately hitting the man.

This weekend, the shocking footage went viral online, showing the driver asking his pals “ready?” as the passenger films, laughing.

“Yeah, hit his ass,” he tells the driver before plowing into the retiree.

The disturbing clip, reviewed by the Daily Mail, begins with the passengers cursing at other cars as they speed by on the North Tenaya Way, near West Centennial Parkway.

Video shows the car approaching a man in red riding a bicycle on the side of the road from behind. With his friends’ encouragement, the driver pulls into the bike lane behind him, honks his horn, and deliberately smashes directly into his back tire with a loud bang, sending the cyclist flying.

The passenger films the man lying helplessly on the side of the road behind the vehicle.

“Damn that n—a got knocked out!” the passenger says as the driver can be heard stepping on the gas.

Probst was taken to University Medical Center where he was pronounced dead, according to the Review Journal.

It’s not clear if the passenger who filmed the killing has been charged with any crime.

The 17-year-old was arrested the same day as the Probst’s death on suspicion of hit and run. He was later charged with murder because of the video, though the date the charges were set was not clear.

The former cop had moved to Sin City after he retired as chief of police in Bell, California in 2009, according to reports.

Earlier this month, a memorial service was held for Probst, who spent 35 years in law enforcement, KLAS reported.

“He was honestly like a ray of sunshine,” Taylor Probst said of her father. “That just bled through your life.”

“He was an amazing man, a husband,” Probst’s wife, Crystal, added. “A father, a brother.”