A fresh appeal about the murder of 13-year-old schoolgirl Amanda 'Milly' Dowler was launched today following the conviction of Levi Bellfield.

The 39-year-old was found guilty this afternoon of killing 22-year-old Amelie Delagrange on Twickenham Green in August 2005 and Marsha McDonnell, 19, in February 2004.

An Old Bailey jury could not reach a decision over the attempted murder of Irma Dragoshi in Longford and the attempted kidnap and false imprisonment of Anna-Maria Rennie in Whitton in 2001.

The former bouncer will now be questioned by Surrey Police officers over Milly's death six years ago.

Milly's mum and dad, Bob and Sally Dowler, have joined Surrey Police in pleading for information into their daughter's death.

"Imagine not knowing how your daughter died, or where and when and by whose hand, and imagine how we as a family live.

"If you know anything that could help answer these questions, please find it in your hearts to let us know," her parents said.

Milly had been walking home along Station Avenue, Walton, on March 21, 2002, when she was abducted and later murdered.

Six months after her disappearance - on September 18, 2002 - her body was found by mushroom pickers in Yateley Heath, Hampshire, and her body identified from dental records by a forensic team.

Surrey Police and Crimestoppers are offering a £50,000 reward for information that leads to a conviction.

Milly's parents' appeal

Police are still trying to trace a red Daewoo Nexia which was caught on CCTV in the area where Milly disappeared.

To help the police search the vehicle's registration number N503 GLT and chassis number KLATF68V1SB554108 are being released for the first time so that car owners and people in the motor industry can check their records.

Officers are still trying to trace some of Milly's property including her Heathside school uniform, black 'Pod' platform shows, a blue Nokia 3210 mobile phone with 'Milly' written on the black and a beige and black JanSport bag containing school books and purse with a playing card design.

Detecive Chief Inspector Maria Woodalll, the senior investigating officer, said: "Milly was an innocent 13-year-old girl and her killer deserves no respect or protection. Someone knows who is responsible for her death nad now, nearly six years on, I am urging them to speak to us."

Anyone with information should call Surrey Police on 01483 637 637 or Crimestoppers on 0800 555 111.

Timeline: What happened to Milly?

Thursday, March 21, 2002: Walton schoolgirl Amanda Milly' Dowler disappears on her way home from school. She was last seen at Walton-on-Thames railway station.

Saturday, March 23: As fears grow for Milly, more than one hundred residents join the search for her. Police begin examining CCTV footage.

Monday, March 25: Police continue to check CCTV footage, focusing on film of Milly leaving the train station. Her parents make an an emotional appeal for information. Robert Dowler, described his daughter as bright, intelligent, witty and lovely. He went on to say: "It is my wife's birthday this week and the best present to have would be having Amanda home safely".

Wednesday March 27: Police and resident widen their search for Milly, as her last movements are featured on the Crimewatch programme. Police will not rule out the possibility she may have run away with a secret boyfriend.

Thursday April 4: After checking through Milly's email, text and phone message, police say they are following several leads. More than 1,000 calls are received; detectives say they revealed little of interest to them.

Wednesday April 10: The search for Milly goes on, with her tearful parents visiting the National Missing Person Helpline centre in London.

Wednesday, April 24: A body found in the Thames is not that of missing Walton schoolgirl Amanda Dowler, police confirm.

Wednesday, May 15: More than 450 unconfirmed sightings of missing teenager Amanda Dowler have been reported to police since a national newspaper issued a £100,000 reward for her safe return last week. None of them prove to be of significance.

Wednesday, June 26: Milly's family are being prepared for the worst by police liaison officers. It is more than three months since she disappeared, and "we are trying to prepare the family for every eventuality", say police.

Wednesday, July 3: A report in the Sunday Mirror claiming the Milly investigation has been marked by blunders, and is "rudderless", is angrily denied by police chiefs.

Tuesday, July 30: Police arrest a man in relation to Milly's disappearance. The police search has so far covered at least 270 sites including 50km of water. Police have taken 1,500 statements and analysed over 100 exhibits.

Tuesday, August 6: The man arrested a week earlier is released. He is the third person to be arrested and released by police investigating Milly's dispearance. Police say she was the victim of a "chance abduction".

Wednesday, August 14: Officers in charge of the search for Milly meet with detectives investigating the disappearance of Soham, Cambridgeshire, girls Holly Wells and Jessica Chapman.

Friday, September 13: In a major breakthrough, FBI digital analysis of CCTV footage at Walton-on-Thames, on the day Milly disappeared, shows a figure standing next to a car. It is believed to be Milly.

Friday, September 20: Forensic analysis confirm a body found in woodland near Fleet, Hampshire, is that of Milly Dowler. Police continue a painstaking search of the woods. Milly's parents speak of their relief, but say the monster who killed their daughter must be found.

Tuesday, October 1: Witnesses tell police they say two men, one muddied and the other carrying a shovel, in the Hampshire woodlands where Milly was found, three days after she disappeared.

Thursday, October 17: An inquest opens into the case of Milly Dowler, and is adjourned after her identification is confirmed.

Thursday, October 24: A witness claims to have seen Milly standing in the Hampshire woods with two men, in what police say is a "significant development."

Friday, November 8: Experts identify the model of car spotted on CCTV footage at the time Milly vanished, as a Mazda MX-6.

Tuesday, February 11, 2003: After linking DNA taken from Milly's bedroom to samples found at a burglary in Sunderland, police say they have been unable to link it to any local people.

Friday, March 21: A year after she disappeared, Milly's family and friends will hold her funeral. Police will spend the next two days talking to people at Walton-on-Thames station, where she was last seen alive.