( CNN ) Eric Frein accused of killing a state trooper and injuring another , on Thursday entered a not guilty plea by video from Pennsylvania 's Pike County Correctional Facility during his arraignment , according to his attorney . The attorney , Michael Weinstein , attended the hearing in Milford , Pennsylvania , to enter the plea on behalf of his client , while co-counsel William Ruzzo was with Frein at the jailhouse . Weinstein said his client appeared fine , and understood and answered questions asked by the judge . Prosecutors are seeking the death penalty for Frein , who is accused of shooting two state troopers -- killing Cpl . Bryon Dickson and injuring Trooper Alex T. Douglass . Frein faces a dozen charges , including terrorism and first-degree murder , in connection with the September ambush outside the state police barracks in Blooming Grove , Pennsylvania . Frein led a small army of law enforcement officers on a weeks-long manhunt in eastern Pennsylvania . The self-styled survivalist and military buff was captured on October 30 at an abandoned airport . Who is Eric Frein ? The manhunt lasted almost seven weeks , and involved as many as 1,000 officers at times . Authorities said the search cost more than $ 11 million in salaries , travel , equipment , utilities and other expenses . Prosecutors had previously said they intended to seek the death penalty . They submitted the formal paperwork on Tuesday . Frein 's lawyer said the move was expected . `` There 's a lot of work ahead , and there 's just so much more to do , '' Weinstein said . `` We need to make sure we have everything analyzed correctly . Right now , it 's all just in the early stages , so once we get the evidence laid out we can go from there , '' he said . Police uncover Frein 's trove of survival supplies . After his arrest , Frein allegedly told investigators he `` wanted to make a change ( in government ) and that voting was insufficient to do so , because there was no one worth voting for , '' according to a court affidavit . Frein called the killing of Dickson an `` assassination , '' the court documents said . The suspect said the shootings were an attempt to bring about a change in government and to `` wake up people , because it was all he could do . '' Frein charged with terrorism . CNN 's Ray Sanchez and Dana Ford contributed to this report .
Eric Frein 's accused of killing Cpl . The FBI is investigating the shooting death of a Pennsylvania National Guard soldier who was shot by an alleged sniper on his way to work at Fort Carson Thursday. He led small army of law enforcement officers on a weeks-long manhunt . The self-styled survivalist and military buff was captured in October .