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DNA evidence has linked an air conditioning repairman to the stabbing deaths of three women, including a former girlfriend of actor Ashton Kutcher, police said Friday.

Michael Gargiulo, 32, of Santa Monica has been in custody since July for a separate knife attack and could face murder charges as soon as next week, police said.

Santa Monica police Lt. Darrell Lowe said DNA collected from a crime scene last spring helped link Gargiulo to the stabbing deaths of women from Los Angeles, suburban Chicago and Monterey Park.

One of the cases involves 22-year-old Ashley Ellerin, Kutcher's former girlfriend, who was found dead in February 2001 in her Hollywood Hills home.

Kutcher, who starred in the television series "That '70s Show" and is married to actress Demi Moore, told police he went to pick up the fashion student-model for a post-Grammy Awards party, but she did not answer the door. He checked a back window and spotted what he thought were red wine stains on the carpet and then left. Her body was discovered the next day by a friend