The parents of Melanie Hall, whose remains have been found on an M5 slipway more than 13 years after she went missing will appeal for the public's help in tracing her killer at a press conference this morning.

Hospital worker Melanie Hall, 25, from Bradford Leigh, near Bradford on Avon, went missing in June 1996 after a night out in Bath, which ended at the Cadillacs nightclub in Walcot Street, now Club XL.

Further tests will be carried out on the remains - found in a bag and buried near a slip road at junction 14 of the M5, on Monday. It is believed jewellery found with the remains were confirmed as belonging to Melanie by her parents.

Steve and Pat Hall will host the press conference at Bath police station this morning at about 11am.

The last sighting of Miss Hall was at 1.10am on June 9, when she was sat on a stool at the side of the dancefloor.

She had been out with friends and her boyfriend of three weeks Phillip Kurlbaum, a surgeon at the Royal United Hospital in Bath, where she worked as a clerical officer.

Despite a police reward of £10,000 and several appeals on television, including the BBC's Crimewatch in November 2006, no trace of Miss Hall was ever found.

A workman clearing vegetation on the slip road off the northbound M5 found a number of bones, including a skull and pelvis. Other remains were found partially buried nearby.

In 2003, police arrested two men in connection with her disappearance but they were released without charge after police searched a farm near Bath and the cellar of a charity shop in Chatham Row.

In 2004, an inquest was held which recorded an open verdict, although Avon coroner Paul Forrest said the circumstances of the case suggested Miss Hall had been unlawfully killed.