Sioux City man charged with murder after allegedly killing motorcyclist

SIOUX CITY, Iowa (KCAU) — A Sioux City man has been arrested for the murder of a motorcyclist.

The Sioux City Police Department said in a release that officers were alerted Sept. 2 and 8:42 p.m. of a motorcycle crash near the intersection of West 20th Street and Rebecca Street.

Officers arrived and found a man Bret B. Siebold, 65, of Sioux City, suffering from a head injury. He was taken to a local hospital and then life flighted to University of Nebraska Medical Center with life threatening injuries.

Police started an investigation and found the crash was not accidental, having learned that two people had gotten into an argument before the crash. A witness also told police they saw something thrown at Siebold while he was on a motorcycle before hearing “a specific sound” and then seeing Seibold go to the ground.

Siebold later died from his injuries on Sept. 8.

The Sioux City Police Department arrested Michael P. White Thunder, 33, of Sioux City, for second-degree murder on October 9.

The Sioux City Police Department are continuing to investigate the incident. Anyone with information about this incident is asked to call the Sioux City Police Department at 712-279-6440, or the anonymous tip line 712-258-TIPS (8477).

For the latest news, weather, sports, and streaming video, head to SiouxlandProud | Sioux City, IA | News, Weather, and Sports.