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Bennett set to honour Winehouse at MTV awards

MTV is to honour tragic singer Amy Winehouse with a special tribute this weekend.

Tony Bennett -- who recorded a duet with Winehouse (below) in what was her final session -- will pay tribute to the singer at Sunday's MTV Video Music Awards show in Los Angeles.

Bennett (85) will introduce footage from the recording in London in March, where the two sang Body and Soul.

The duet will be released as a charity single in September.

Mystery still surrounds the cause of the singer's death after toxicology tests showed no illegal drugs in her system.

Her family said in a statement that "alcohol was present" in the singer's body but it hasn't yet been determined if it contributed to her death.

The 27-year-old soul diva, who had battled drug and alcohol addiction for years, was found dead in her London home on July 23, and an initial post-mortem failed to find the cause of death.

A statement released by spokesman Chris Goodman on the family's behalf said "toxicology results returned to the Winehouse family by authorities have confirmed that there were no illegal substances in Amy's system at the time of her death."

An inquest is due to begin on October 26.