By Mary Manning

Published Wednesday, July 16, 2008 | 3:56 p.m.

Updated Tuesday, Oct. 28, 2008 | 10:15 a.m.

A Metro Police detective who had previously arrested a man was assaulted by the same man on the 215 Beltway and Jones Boulevard at about 6:46 a.m. today.

Donald Mason

The detective was driving an unmarked Metro car today, and when officers arrived they found the detective and a citizen restraining 40-year-old Donald Mason of Las Vegas.

Metro's Violent Crimes Unit discovered that Mason had previously been arrested by the detective and had been stalking the officer, police said.

Police said Mason rammed his 1994 Toyota SUV into the rear of the detective's vehicle, causing it to cross the center divider line into oncoming traffic. The SUV that Mason drove left the pavement and rolled over at least once before coming to rest on its wheels, police said.

The detective regained control of his vehicle and began to approach the suspect's vehicle to check for injuries. Police said Mason left his vehicle with a screwdriver in hand and began attacking the officer.

A passing motorist stopped and assisted the officer in subduing and restraining Mason until more officers arrived, police said.

The detective, an eight-year veteran, was taken to University Medical Center, where he was treated and released for injuries from the attack.

Mason was arrested on one count each of attempted murder on a police officer, resisting a police officer with a deadly weapon, aggravated stalking and two counts of battery with a deadly weapon.

Mason's criminal history includes arrests for gross lewdness, narcotics violations, DUI and domestic violence battery, police said.