Oakland County sheriff’s investigators are searching for the motorist who struck a bicycle ridden by a 31-year-old man late Thursday.

The crash occurred just after 11 p.m. on Baldwin Avenue at Rundell Avenue in northern Pontiac. The victim, a Pontiac man, was riding his bicycle northward when struck by a black Jeep Grand Cherokee.

“The driver drove away from the scene without stopping to render aid,” the sheriff’s office reported, asking any witnesses or anyone with information to contact investigators.

A witness had followed the Jeep onto a side street, where the driver and a passenger parked, got out of the vehicle, and left in a different car, a silver Chevrolet Malibu. The Grand Cherokee was impounded.

“We are seeking the public’s help to locate and identify the individual involved in this hit-and-run fatal crash,” Sheriff Michael Bouchard said. “Obviously, basic humanity was not exhibited by leaving an individual to die in the street. We are seeking anyone with information that could help bring this individual to justice.”

The sheriff’s office said speed appeared to be a factor in the crash.

“Anyone with information about the driver or the passenger is asked to call Crime Stoppers at 1-800-SPEAK-UP,” the sheriff’s office said. “Crime Stoppers is offering a reward of up to $2,000 for information leading to an arrest in the case. Tipsters remain anonymous.”