Arrest made in investigation of 1988 murder
The court heard Brown had been fascinated by the occult, tarot cards and numerology.
He had also been quizzed as part of the initial investigation, but it was not until advances in DNA technology that police were able to find vital evidence against him.
His DNA profile was on a piece of tissue paper recovered in 1988 on the attacker's escape route, and he was also linked by his interest in numerology to a Swan Vesta matchbox found at a derelict house nearby, which had his date of birth, the number of Mr Slater's house, and the date prior to the murder written on it.
Brown's interest in the occult was shared with his younger brother Patrick and their friend, Joe Henry.
Although there are claims that the court was "fascinated" there is little to show why or explain more than a matchbox with numbers on it.