Late on the night of Sept. 12, Eric Frein hunkered down in the woods across from the Blooming Grove state police barracks in Pike County.

Dressed in camouflage and armed with a .308 rifle, Frein, 31, of Canadensis, waited until two troopers, Cpl. Bryon Dickson, and Alex Douglass, left the building at about 11 p.m. during a shift change.An expert marksman and self-styled survivalist with a grudge against authorities, Frein opened fire.Dickson was killed, and Douglass critically injured.Frein fled in his parents' Jeep, but drove it into a retention pond about 2 miles from the barracks. He abandoned it there, leaving his Social Security card, driver's license, two spent .308 cartridge casings that matched bullets recovered from the shooting scene and other evidence.A man walking his dog in the area the Monday after the shooting spotted the Jeep, giving police their first break in the case.A search of the home where Frein lived with his parents turned up a book on how to get a job as a sniper, more cartridge casings of the same type as were found in the Jeep and at the barracks, and other evidence. Missing from the home was an AK-47 and a .308 rifle with a scope.Police found computer hard drives that revealed Frein had for years researched how to assassinate and elude police.The hunt for Frein rallied thousands of law enforcement authorities, including the U.S. Marshals who eventually captured him on Oct. 31 as he walked across a field near an abandoned airport hangar in the old Birchwood-Pocono Airpark.Frein was unarmed, but had weapons in the hangar, which he had supplied with all the comforts of home.Why Frein shot the troopers has yet to surface.The cost of the hunt tallied about $11 million. Frein is in Pike County jail, without bail, charged with first-degree murder and a host of related charges.His preliminary hearing has been scheduled for Jan. 5.Pike County District Attorney Ray Tonkin has said he plans to seek the death penalty.