Ken Kilpatrick

A "military brat," Kilpatrick was born at Robins Air Force Base, in Warner Robins, Georgia on February 11, 1964, where he lived for his first four years. His father Richard Kilpatrick was a United States Air Force enlistee, and his mother Diane Kilpatrick was a waitress and dancer who had her first son when she was 15. Shamrock had three brothers and grew up in a predominantly black neighborhood of Atlanta, Georgia.

He was often left to fend for himself, and, without his parents' supervision or guidance, got into many fights. His father abandoned his family when Shamrock was five. His mother married an Army aviator named Bob Nance, and the newly formed family moved to Napa, California, Nance's hometown. Shamrock and his brothers were outsiders in this community, coming from a poor background and speaking in a Southern accent. They continued to cause trouble and get into fights and began using drugs. Nance, who fought in the Vietnam War, joined the local fire department and also worked in roofing and upholstery. Shamrock became involved in and excelled at sports at a young age, playing in Little League baseball and Pop Warner football. Nance remembers a veteran coach telling him that he had never seen a player with as much heart and tenacity as the young Shamrock. Shamrock was not as involved with drugs as his brothers, such as his brother Richie, who enjoyed smoking marijuana and eventually using heroin intravenously, but who also played football.

At age 10, Shamrock ran away from home for the first time, and was stabbed by another child on the run, ending up in the hospital. When he was 13, his stepfather kicked him out of their home, and each of the brothers went their own ways. Shamrock lived in stolen cars and would often rob people at knifepoint as a means to survive, before being placed in a foster home. He went through seven group homes and served time in a juvenile hall. He moved between several more group homes before being placed in Bob Shamrock's Boys' Home in Susanville, California at age 14, where he turned his life around. Bob Shamrock legally adopted Ken as his son, and Ken changed his last name from Kilpatrick to Shamrock in Bob's honor.

At Lassen High School, Shamrock (known there as Kenny Nance) excelled in football and wrestling. Shamrock credits organized sports, as well as his adoptive father, Bob, for his life turning around. As a senior, he qualified for the state championships in wrestling, but broke his neck in practice days before the competition and underwent neck surgery. Due to the injury, he received no scholarship offers from any big colleges, and doctors told him his sports career was likely over. Against doctors' orders, he joined the Shasta College football team, where he was voted team captain in his final season. The San Diego Chargers of the National Football League later offered him a tryout, but he declined in order to pursue a career in professional wrestling, where he debuted in 1989 in the North Carolina based South Atlantic Pro Wrestling promotion.