Authorities say the man accused of fatally shooting an Arizona state trooper and wounding another has no criminal record and a history of mental illness.
State Department of Public Safety director Col. Frank Milstead on Thursday identified the suspect in the fatal shooting as 20-year-old Isaac D. King.
During a news conference from DPS headquarters, Milstead said the suspect is on medication for anxiety and depression.
Authorities say four troopers responded Wednesday night to reports of someone throwing rocks at vehicles on Interstate 10 several miles west of downtown Phoenix.
As they attempted to take King into custody, a fight ensued.
Officials say the suspect somehow got a hold of a plain-clothed trooper's weapon and fired at least two shots.
Trooper Tyler Edenhofer was fatally shot.
A second trooper suffered a wound to the shoulder.
