Criminologist Prof David Wilson conducts a series of interviews with convicted murderer Bert Spencer, the man suspected of - yet never charged with - killing paperboy Carl Bridgewater in 1978 ...

Criminologist Prof David Wilson conducts a series of interviews with convicted murderer Bert Spencer, the man suspected of - yet never charged with - killing paperboy Carl Bridgewater in 1978 ...

Robert Black, who died in prison in 2016, is one of the world's most notorious serial killers who targeted young girls.