updated 5/8/2009 2:25:30 PM ET 2009-05-08T18:25:30

An Italian student on trial with his American ex-girlfriend for allegedly killing her British roommate helped prosecutors on Friday show a crime scene video in which police find potentially damaging evidence, Italian media said.

Raffaele Sollecito — who earned a computer science degree while jailed in the investigation — offered to help when prosecutors had difficulty using a computer to play the video in court, Italian state TV and the ANSA and Apcom news agencies reported from Perugia.

Sollecito and co-defendant Amanda Knox are accused in the 2007 murder of 21-year-old Meredith Kercher.

All three were studying at Perugia's university when Kercher's body was found with stab wounds in a pool of blood in her bedroom of the rented apartment she shared with Knox.

Prosecutors allege Kercher was stabbed during what began as a sex game.

Both Sollecito and Knox have denied all wrongdoing.

The video played Friday by prosecutors shows the Perugia police crime scene squad finding the clasp end of Kercher's bra. Prosecutors say Sollecito's DNA was found on the piece.

Sollecito used a defense team computer to help prosecutors show some of the video in court, the Italian news reports said.

Trial began in January for Knox, a 21-year-old from Seattle, and Sollecito, 24. If convicted, they could face life in prison. They are also accused of sexual violence.

A third person, Rudy Hermann Guede, a national of the Ivory Coast, was convicted of the murder in a separate trial.

More on Amanda Knox

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