updated 3/4/2009 12:35:12 PM ET 2009-03-04T17:35:12

Authorities say a suspect in the shooting of an elderly couple outside an Arizona Wal-Mart has killed himself after being stopped by police in New Mexico.

Donald Belanger died Tuesday after being pulled over near Albuquerque for driving slowly, New Mexico state police spokesman Peter Olson says.

The 55-year-old Belanger was suspected in a shooting Monday outside a Wal-Mart in Show Low, Ariz., that killed a woman and critical wounded her husband. The motive was unclear.

New Mexico police say the officer who stopped Belanger saw a flash as he approached the car and realized Belanger had shot himself.

Two handguns and what Olson described as "some sort of suicide note" were in the car. Authorities discovered later that Belanger was wanted in Arizona, he said.

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