Miss Pearman's body was found by a lorry driver at about 3.50am. She was last seen alive in Rouen Road, Norwich, at 1.15am the same day.
At the time of the initial investigation, DNA samples were taken and loaded onto the national database but no match has yet been found.
Over the years, more than 4,000 people have been interviewed and hundreds of men provided DNA samples for testing.
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After what's been the hottest day in the region for almost 10 years there are warnings tonight about the dangers of swimming in open water.
Today was the hottest day of the year so far but temperatures will be down a little tomorrow with the risk of thunder.
A sizzling day for the Anglia region with temperatures rocketing into the mid 30's.