Upcoming episodes, programme details and where to watch over the next seven days. All times are UK time.
Peter Manuel, a Scottish serial killer, murdered at least eight people around Greater Glasgow between 1956-1958, evading police several times before his arrest and courtroom defence. (S4 Ep1)
Born in 1832, Mary Ann Cotton, the Black Widow, married lonely men across northeast England, had them take out life insurance, then poisoned them with arsenic to claim the payouts. (S4 Ep2)
Dr Ruxton, a physician living quietly in Lancaster, let jealousy over his wife's alleged infidelity turn violent in 1935, killing her and the housemaid, then dismembering both bodies. (S4 Ep3)
On 12th August 1966, Harry Roberts and two accomplices murdered three police officers in Shepherd's Bush, sparking manhunt and public outrage that fuelled calls to restore the death penalty. (S4 Ep4)
In 1955, London nightclub manager Ruth Ellis confessed to murdering her abusive lover and went on to become the last woman ever to be executed in Britain. (S3 Ep4)
Jack the Ripper, the infamous serial killer, murdered five women on the streets of Whitechapel and evaded capture. (S5 Ep1) (Part 1 of 2)