John David Guise Cannan (born 20 February 1954) is a British murderer and rapist.
Cannan, a former car salesman, was convicted in July 1988 of murder and sexual offences.
He was given three life sentences, with a recommendation that he never be released, for the murder of Shirley Banks in Bristol in October 1987, the attempted kidnapping of Julia Holman on the previous night and the rape of a woman in Reading, Berkshire in 1986.Cannan is the only suspect in the murder of Suzy Lamplugh, who vanished in July 1986 after going to meet a man calling himself 'Mr Kipper'.
In November 2002, however, the Crown Prosecution Service decided that there was insufficient evidence to charge him.
That month, Scotland Yard held a press conference at which, in a rare move, officers named him as the man they believe murdered Lamplugh.