{Sistersville, West Virginia}...Authorities say 38 year old Thomas Fritz of Sylvania, Ohio fatally shot himself in a remote cabin in Sistersville, in Tyler County, West Virginia Tuesday night after seeing U.S. Marshals closing in on him. Police say Fritz shot his ex-girlfriend, Amy Merrill, her pregnant sister, 24 year old Lisa Gritzmaker, and their mother, Robin Lynn McCowan, on Friday in Blissfield, Michigan at a home he and Merrill shared until recently. Only McCowan survived. Authorities say Amy Merrill had broken up with Fritz about three weeks ago. Fritz served in the Ohio National Guard beginning in 1997 and later the Army Reserve. He then spent nearly a year in Iraq with the guard's military police unit from the spring of 2003 through early 2004.