His trial had been set for April 28.
Knapp, 46, a wilderness survivalist, allegedly burglarized numerous cabins in several Utah counties over approximately six years, managing to elude cabin owners and law enforcement officers. Authorities finally got a solid lead on his whereabouts last April from a group of people collecting antlers on central Utah's Ferron Mountain who reported seeing someone who looked like the wanted man.
Emery County deputies tracked Knapp for several days, following as he wandered near the Ferron Reservoir area of Sanpete County. On April 2, a Utah Highway Patrol helicopter spotted Knapp chopping wood outside a cabin. Police say Knapp fired a weapon at the helicopter and also pointed a weapon at officers before he was taken into custody.
The federal indictment alleges Knapp was armed with an SKS-type assault rifle and a .357 caliber handgun, which authorities previously have said were stolen during a Sevier County burglary.
Six counties have filed state charges 26 felonies and 13 misdemeanors in all against Knapp related to the break-ins of cabins. The state cases have been on hold while the federal case went forward.