By | December 25 2012 5:21 PM

Armed with a Smith and Wesson .38 revolver, a pump-action Mossberg shotgun, and, most chillingly, a .223 Bushmaster rifle rigged with a flash suppressor to conceal the source of fire, William Spengler, 62, crouched on an embankment behind a tree Monday while his car, home and the remains of his 67-year-old sister Cheryl were in flames.