Serial killer Robert Black told how he would lure victims in chilling interviews to be broadcast this week.
The notorious child killer was convicted of murdering four young girls, including nine-year-old Jennifer Cardy from Co Antrim.
In chilling video recordings Black gave details of how he would have killed Genette Tate, a 13-year-old girl snatched and murdered on her village paper round in 1978.
Though he was the prime suspect in the case, he died in Maghaberry Prison in January last year before detectives could charge him.
The 68-year-old paedophile was serving 12 life sentences for the kidnap and murder of the young girls, including the horrific killing in 1981 of Jennifer from Ballinderry. In a series of interviews he outlined his crimes and hinted he may have had as many as 40 victims.
The audio clips were taken from a 1990 interview with sex offender counsellor Ray Wyre.
They will feature in the opening episode of CBS Reality channel documentary Voice Of A Serial Killer on Wednesday night
In an attempt to get evil Black to open up about his modus operandi, Mr Wyre asked him how the murder of Genette could happen.
Black answered: "He's either persuaded her to get off her bike or grabbed her off the bike.
"Then got her into a vehicle."
When asked what he would do, he said: "I'd park and watch to see what sort of paper route. Getting myself into a position where it would be possible to take (her)."
This is what police believe happened to her.