A man burst into a trailer home Sunday and shot to death his two children, his estranged wife and her boyfriend before killing himself along a road in southern Indiana (search), police said.

Arthur Lee Smith (search), 36, entered the home his estranged wife shared with her boyfriend and shot both of them in the head. Smith then entered a bedroom and shot his and his wife's two children, ages 4 and 5.

Minutes after a neighbor reported the gunfire to police, an officer confronted Smith, who was walking along a roadway, telling him to stop.

"He just kept on walking and then pulled out a 9 mm Ruger (search) pistol, put it to his head and killed himself," state police Sgt. Todd Ringle said.

Smith and his wife were estranged but had not divorced. Alicia Smith had obtained a protective order against her husband.

Loogootee is about 80 miles southwest of Indianapolis.