( CNN ) -- A police officer jailed on a first-degree murder charge in a two-state shooting rampage was on his computer at the time of shootings and could not have committed them , prosecutors said Tuesday evening . Brian E. Dorian , 37 , was to be released on his own recognizance Tuesday night , and charges against him will be formally dismissed Wednesday , Will County State 's Attorney James W. Glasgow announced . `` I feel horrible that Brian Dorian went through this , '' said Glasgow , adding that evidence at the time and identification in lineups merited the charges . `` At no time did we stop looking for exculpatory evidence . '' A forensic analysis of Dorian 's home computer and its activity put Dorian at home at the time of the shootings , authorities said . The officer also told them he was watching sports programs and using e-mail . John Dorian , the officer 's father , told CNN affiliate WLS he was `` relieved '' and `` never doubted his son . '' Police now are looking at other leads in the shootings . Earlier in the day , Dorian appeared in court via a hookup from the Will County Jail . He did not speak but his attorney entered a not guilty plea , WLS reported . Several friends and relatives wore T-shirts bearing the message `` Free Brian . '' `` There 's an innocent man sitting behind bars and somebody else is running around out there knowing that he got away with it . It 's not fair , '' Jill Aggen , a friend of Dorian , told WLS . `` No doubt in my mind . He 's not capable of it . '' Dorian , an officer with the Lynwood Police Department , was arrested Friday in the killing of one person and the wounding of three others in the spree , which occurred south of Chicago , Illinois . He was held on a probable cause warrant , and bail was set at $ 2.5 million . Dorian , who according to WLS has been on medical leave for an injured shoulder the past year , was taken into custody Friday at his residence , said authorities . The shootings began about 10:30 a.m. October 5 at a construction site near Beecher , Illinois . The gunman killed one worker at the site and wounded two others , police have said . An hour later and about 10 miles away in Lowell , Indiana , authorities believe the same gunman opened fire again -- this time on a local farmer . Keith Dahl was shot in the left shoulder , arm and elbow , and then was robbed . Dahl told Lake County ( Indiana ) Sheriff 's Detective Robert Martinez that the gunman approached him on his farm and started a conversation about bees before beginning to shoot . The gunman was believed to be using a revolver -- possibly a Colt .38-caliber or .357 Magnum -- because no shell casings were found at either scene , Lake County Sheriff Rogelio `` Roy '' Dominguez said .
Police officer to be freed in Illinois , Indiana shootings . Analysis of computer shows he was at home at time of crimes . Comment: One person was killed and three wounded in shootings south of Chicago .