Passage: In 1972, Armstrong visited the town of Langholm, Scotland, the traditional seat of Clan Armstrong. He was made the first freeman of the burgh, and happily declared the town his home. The Justice of the Peace read from an unrepealed 400-year-old law that required him to hang any Armstrong found in the town.While working at his farm near Lebanon, Ohio, in November 1978, Armstrong jumped off the back of his grain truck and his wedding ring was caught in the wheel, tearing off the tip of his left hand's ring finger. He collected the severed digit and packed it in ice, and surgeons reattached it at the Jewish Hospital in Louisville, Kentucky. In February 1991, a year after his father died, and nine months after the death of his mother, Armstrong suffered a mild heart attack while skiing with friends at Aspen, Colorado.Armstrong and his first wife, Janet, separated in 1990 and divorced in 1994, after 38 years of marriage. He met his second wife, Carol Held Knight, at a golf tournament in 1992, when they were seated together at breakfast. She said little to Armstrong, but two weeks later he called her to ask what she was doing. She replied that she was cutting down a cherry tree, and 35 minutes later Armstrong was at her house to help. They were married in Ohio on June 12, 1994, and had a second ceremony at San Ysidro Ranch in California. He lived in Indian Hill, Ohio.In May 2005, Armstrong became involved in a legal dispute with his barber of 20 years, Mark Sizemore. After cutting Armstrong's hair, Sizemore sold some of it to a collector for $3,000 without Armstrong's knowledge. Armstrong threatened legal action against Sizemore unless he returned the hair or donated the proceeds to a charity of Armstrong's choosing. Sizemore, unable to retrieve the hair, donated the proceeds to charity.

Question: What was the name of the person who Armstrong was going to sue if the hair was not given back?
Sizemore