Cannon would probably have got away with the crime had he not been charged with drug offences late last year, and asked to give a DNA sample - which matched that from the crime scene.
Detective Inspector Mick Johnston, who was involved in the police investigation from the start, said Cannon's conviction validated the use of DNA technology.
"It's a testament to DNA evidence and the legislation that allows us to keep such evidence in relation to unsolved crimes - this is a fantastic result," he said.
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(image credit: BBC)