Murphy was the youngest of three sons of William and Joyce Murphy from the loyalist
Shankill Road,
Belfast. His elder brothers were William Jr. and
John. William Sr. was originally from Fleet Street,
Sailortown in the Belfast
docks area, where he met Joyce Thompson, who came from the Shankill. Like his own father (also named William), William Sr. worked as a dock labourer. The Murphy family changed their residence several times; in 1957 they returned to Joyce's family home in the
Lower Shankill, at 28 Percy Street. Murphy did not use his first name "Hugh" possibly because of its close resemblance to the surname "
Hughes", common among
Irish Catholics, which, when coupled with the conspicuously Irish surname Murphy, might have communicated a Catholic connotation. Prior to the erection of a
peace wall in the 1970s, Percy Street ran from the mainly Protestant lower Shankill area to the mainly Catholic
Falls Road. At Argyle Primary School, he was known for the use of a knife and had his elder brothers to back him up; he logged his first conviction at the age of twelve for theft. After leaving the
Belfast Boys' Model School at sixteen, he joined the
Ulster Volunteer Force (UVF) and was involved in the
rioting that broke out in Belfast in August 1969. In his book
The Shankill Butchers, Belfast journalist
Martin Dillon suggests Murphy's
anti-Catholicism may have stemmed from his bearing a surname associated with Catholics. He brought this hatred of Catholics into all his conversations, often referring to them as "scum" and "animals". He held a steady job as a shop assistant, although his increasing criminal activities enabled him to indulge in a
flamboyant lifestyle which involved heavy drinking and socialising with an array of young women. Dillon wrote that it is "incredible to think that Murphy was in fact a murderer at the age of twenty" (1972). Physically, Murphy was below average height, of slim build and
sallow complexion, blue eyed and with curly dark brown hair. He sported several tattoos, most of
Ulster loyalist images. He was a flashy dresser, often wearing a
leather jacket and scarf, and occasionally leather driving gloves, similar to those worn by a
World War I fighter-pilot. ==First crimes==