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Ashton Kutcher will be taking the stand, and this is no fake movie trial...

The actor dated 22-year-old Ashley Ellerin nine years ago until her shocking murder in 2001. Air conditioning repair man Michael Gargiulo faces trial for stabbing Ellerin 35 times, as well as the murder of two other women and the attempted murder of a fourth.

Kutcher will testify in court against the alleged serial killer next year, describing what happened the night of Ellerin's death. Kutcher claims to have rescheduled a date with his girlfriend at her Hollywood home, but when he arrived at around 10:45pm Ashley didn't answer the door (even though the lights were on and her car was parked outside).

Kutcher told police he peered through a window and saw what he thought was red wine on the floor - actually, it was a pool of blood.

Kutcher then left thinking that Ashley was angry about breaking the earlier date and therefore was refusing to answer the door. Her body was found the following morning by a friend.

Gargiulo was arrested in 2008 after the fourth near-victim survived an attack in her Santa Monica home.