An historian has claimed to have discovered the real identity of Jack the Ripper, and believes the notorious Whitechapel murderer was also responsible for killing two more women.

Mei Trow used modern police forensic techniques, including psychological and geographical profiling, to identify Robert Mann, a morgue attendant, as the killer.

His theory, the result of two years intensive research, is explored in a Discovery Channel documentary, Jack the Ripper: Killer Revealed.

Trow's research is rooted in information from a 1988 FBI examination of the Ripper case, which had worked up a comprehensive criminal personality profile.

The portrait drawn up of Jack was as a white male from the lower social classes, most likely the product of a broken home.

It was also thought he would have had a menial job but with some anatomical knowledge, something like a butcher, mortuary or medical examiner's assistant or hospital attendant.