Avon and Somerset police say they hope new developments in DNA profiling will help catch the killer of a young woman in Bath.
Melanie Hall was last seen alive in a city nightclub 20 years ago this week.
Melanie's body was found 13 years later in woodland near the M5 motorway. Her parents say they hope the anniversary of her disappearance will finally bring some answers.
Jon Kay reports.
Read more Melanie Hall murder probe: DNA evidence discovered
