WASHINGTON — The Department of Defense said no criminal charges will be filed against military contractor KBR in connection with the electrocution of a Green Beret soldier who was electrocuted while showering in his barracks in Iraq.

Investigators said there was "insufficient evidence to prove or disprove" that anyone was criminally culpable in the January 2008 death of Staff Sgt. Ryan Maseth, 24, of Shaler Township, Allegheny County. The uproar over his death triggered a review of 17 other electrocution deaths in Iraq and widespread inspections.

The Pentagon inspector general said last week Maseth died when he came in contact with an energized metal shower and hose caused by the failure of an ungrounded water pump installed by KBR.

Last month, the Defense Department's Inspector General issued his report, which stated military leaders and KBR failed to protect Maseth. Earlier this year, an army investigator changed the manner of death of Maseth from accidental to negligent homicide.

Maseth's mother, Cheryl Harris, lives in Cranberry Township.