Mark Robert Williams was jailed at Winchester Crown Court yesterday A VIOLENT knife attacker who had previously spent nine years behind bars for rape was described as a 'very dangerous man' by a judge who handed him a life sentence. Mark Robert Williams slashed his three victims with a knife, leaving two of them bleeding heavily from the neck with life-threatening injuries. Williams, 37, committed his violent crimes in the space of several hours on the night of Thursday, February 18. In the first incident, the defendant attacked a sex worker he arranged to meet. He went on to assault a teenage girl before holding both females hostage.