JANESVILLE, Wis. (WTAQ) - A Janesville man has arrested for the murder of a Jeep passenger after a late night argument at an intersection.

Police said 44-year-old James Humphrey is suspected of shooting 30-year-old Samuel Aegerter of Janesville to death on Friday night. Humphrey was arrested Monday afternoon at his workplace, and police would not say how he came to be a suspect. He’s being held on a possible charge of first-degree intentional homicide, and he’s due in court Tuesday.

Police said Aegerter and a group of motorcyclists were arguing at a five-way intersection in downtown Janesville. And when the Jeep went forward, the bikers followed it – and one of the riders shot Aegerter, who was in the back seat. Nobody else in the Jeep was hurt. A murder weapon was not recovered as of Monday night.