A utility worker from Flagstaff was attacked by a man while doing paperwork in his work truck Wednesday morning in Cottonwood. Police responded to the area of Cactus Street and North Main Street on a report of a man hitting another man repeatedly in the head with a rock. When officers arrived they immediately arrested 44-year-old Rian Lloyd Wilson from Glendale. The victim, a 49-year-old utility worker, was inside his work truck when Wilson walked up and starting banging on the closed window. When the victim attempted to open the door to speak to Wilson, he broke the driver door window and immediately began assaulting the victim with a rock to his head. The assault continued until the victim was able to gain some control of Wilson and yelled for help. Several bystanders came to help and one person restrained Wilson and waiting for law enforcement to arrive. The victim sustained serious head injuries from the attack and was taken to Verde Valley Medical Center for treatment. It’s unknown what motivated Wilson to commit the assault as it’s believed the two didn’t know each other. Wilson was booked into the Yavapai County Jail on multiple counts of aggravated assault and criminal damage.