Lynch is the youngest in a family of eight children born to Paddy and Bridie Lynch. His older brother, Frank, is an amateur boxer and he also participates in the sport as well as Gaelic football and hurling. He is a member of the winning Dungiven GAC team which wins the Féile na nGael Division 3 in Thurles, County Tipperary in 1971. In 1972 he captains the Derry Hurling team to an Under-16 All-Ireland title at Croke Park in Dublin by defeating the Armagh GAA club.
Lynch is tried, convicted and sentenced to ten years for stealing shotguns, taking part in a punishment shooting and conspiring to take arms from the security forces. He is sent to the Maze Prison in County Down, Northern Ireland in December 1977. He becomes involved with the blanket protest and joins the 1981 hunger strike at the Maze on May 23, 1981. Kevin Lynch dies at Maze Prison 71 days later on August 1, 1981.
The Dungiven hurling team is renamed Kevin Lynch’s Hurling Club in his honour after his death.