BOSTON, Massachusetts (AP) -- A Massachusetts man pleaded guilty Tuesday to beheading a man and burying the head in a Florida park. Eugene McCollom, 40, was sentenced to 10 to 12 years in prison on manslaughter charges in the 2001 killing of John "Jackie" Leyden. Leyden, who knew McCollom from Alcoholics Anonymous, was stabbed several times and beaten with a metal pipe. No motive was given. McCollom told investigators where to find Leyden's head.