Funeral service for 82-year-old David Leon Martin of Thornton will be Monday, May 20th at 10:30 a.m. at the United Methodist Church of Thornton. Visitation will be Sunday, May 19th from 5:00 to 7:00 p.m. at the Woodley Funeral Home in Thornton. David Leon Martin passed away Monday, May 13th at the Good Shepherd Health Center in Mason City.