Gunman suspected of killing four people in Arizona shoots himself as SWAT team closes in

A suspected killer who may be responsible for four recent slayings in Arizona, including of a well-known forensic psychologist, committed suicide early Monday.

Sources told ABC News that a robot determined the gunman took his own life after the man had exchanged gunfire with SWAT teams.

The suspect was identified by local TV outlets as 56-year-old Dwight Lamon Jones.

Police swarmed an extended stay hotel in a Phoenix suburb where they believed Jones had been staying.

He had been described by police as a bald man wearing a dark-colored hat with a short brim. Police released a sketch.

Four people were found dead in a three-day span, including Dr. Steven Pitt, who assisted in the JonBenet Ramsey case in Colorado. He was found dead near Scottsdale on Thursday, one day before the murders of paralegals Veleria Sharp and Laura Anderson.

Marshall Levine, a 72-year-old counselor and life coach, was found dead inside an office building in Scottsdale shortly after midnight on Saturday.

The same gun was used in all four murders, according to ABC News.

"We don't know the relationships or the connections," said Sgt. Ben Hoster.

Pitt, who was 59, assisted in the investigation of the 1996 death of 6-year-old JonBenet Ramsey, found dead at her home in Boulder.

Ten years later Pitt helped Phoenix police in the Baseline Killer investigation as they sought a man who was later convicted of killing nine people.

With News Wire Services

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