( CNN ) -- The body found Saturday in a fortified bunker in Washington state is believed to be a murder suspect who had been hiding inside , the King County Sheriff 's Office said . A sheriff 's SWAT team blew a hole in the roof of the hideout with explosives and saw what they believe to be the body of Peter Keller . It appeared he died of a self-inflicted gunshot wound , the sheriff 's office said . `` They believe the person has been dead for some time . There 's a great deal of blood and a pistol nearby , '' Sheriff Steven D. Strachan said . A bomb disposal unit cleared the bunker to ensure there were no explosives or booby traps , officials said . Deputies earlier said they had Keller , 41 , contained inside the bunker . Authorities fired tear gas late Friday into the bunker , set into the Cascade foothills about 25 miles east of Seattle . It was unclear whether the gas went deep enough to have any effect . Keller had not been seen since Sunday following a fire at his home , where the bodies of his wife and teenage daughter were discovered . His standoff with authorities began Friday after investigators found evidence that led them to the bunker near Rattlesnake Ridge Trail , according to the sheriff 's office . Authorities did n't immediately send deputies in because of safety concerns . Investigators do not have a clear motive for the slayings , according to Sgt . Cindi West of the King County Sheriff 's Office . Keller , who did not have a criminal record , was described as a survivalist by some relatives , West said . `` We gathered he had a doomsday attitude ... family and friends have indicated he thought the world was going to end at some point , '' West said . Keller likely had plenty of arms and supplies in the bunker , officials said . Clues to Keller 's whereabouts came while investigators were processing evidence at his house , authorities said . People in the area also reported seeing Keller 's pickup truck near the trailhead . `` This is n't a hole in the ground . This is a large built-up structure , '' Strachan said of the bunker . `` But hidden . It took some time to find it . In fact our tactical team smelled the wood smoke coming before they actually saw it . '' Strachan said Keller 's house nearby was set afire Sunday after the slayings , but it failed to spread beyond the kitchen . Authorities found a hard drive with photos , he told CNN Seattle affiliate KING . One photo was enhanced and it aided in the search for Keller , who authorities said had been building the bunker for at least eight years . The sheriff 's office this week obtained an arrest warrant for Keller stipulating two counts of first-degree murder and first-degree arson . CNN 's Phil Gast and Kara Devlin contributed to this report .
A body with an apparent self - inflicted gunshot wound is found . Police believe it is the body of Robert Keller . Keller is suspected of murdering his wife and children . His motive for the slayings is unclear .