Brian Dorian, 37, of Crete, is charged with a one count of first-degree murder in connection with the shooting in Illinois. He is being held on a $2.5 million bail. Charges in the Indiana shooting are pending, according to Lake County Sheriff Roy Dominguez.
Dorian-- who is an officer with the Lynwood police force but has been on medical leave for the past year-- allegedly eluded police for three days after the attacks near Beecher, Ill., and Lowell, Ind. He was taken into custody on Friday morning "without incident" at his Crete home in Will County, Ill.
"I was at the residence," said Will County Sheriff Paul Kaupas. "We observed one lady leave well before we went to the residence. He was in the residence by himself and four pit bulls."
Dorian is being held at an adult detention center in Joliet. He will appear in court next Tuesday.
The sheriffs said their joint task force-- which included investigators working around the clock-- led to the probable cause warrant and Dorian's arrest.
"It's what occurs when you have a cooperation from different law enforcement agencies working together. It builds public trust," Sheriff Dominguez said.
"We shared information openly and quickly, and that's what resulted in this arrest," said James Glasgow, Will County states attorney. Glasgow said the investigation remains at "fever pitch."
The warrant was issued late Thursday and carried out around 12 a.m. Friday.
"This is an ongoing investigation," said Glasgow. "Evidence is being analyzed. We're trying to move it at a break neck pace."
Dorian's father, who lives in Lynwood, adamantly denied his son's involvement.
"My son would never do that. They don't have the shooter. The shooter is still out there," said John Dorian.
Several of Dorian's neighbors reserved judgment Friday night.
"I won't be the judge and I won't be the jury. So it's not up to me to judge him," said Lois Arnold, neighbor.Authorities said they expect to file more charges against Dorian early next week.
Police officer since 1998
Dorian is a Lynwood police officer who has been on medical leave with a shoulder injury since last October. He has been an officer since 1998, working on both the Lynwood and Lansing police forces.
"It's always law enforcement's worst nightmare when someone within the law enforcement community chooses to break the law. It's one of the things we talked about when we process a case like this, it is critical that we act no differently in investigating a police man than we would a lay person," said Glasgow.
The mayor of Lynwood describes Dorian as polite and respectful.
"I don't know that this is the person and in the back of my mind a little bit of hope that maybe it was someone else and this is not quite the truth but still, we get to the truth," said Mayor Eugene Williams, Lynwood.
In 2006, Dorian went to trial in connection with a crash that killed a Crete teenager. He was ticketed for speeding but was not charged with any serious offenses.
Police were still canvassing Dorian's quiet neighborhood Friday.
"It's crazy. It's unbelievable. That's down the block, you know," Frank Affrunti, Dorian neighbor, said.
"We felt comfortable. We said, 'We have a cop living on the street.' The kids always knew he was here and he was friendly," Gina Graefen, Dorian neighbor, said.
The two shootings occurred within hours of each other on Tuesday. In the first shooting near Beecher in Will County, Ill., Dorian allegedly opened fire on two construction workers rehabbing a home. Rolando Alonso, 45, was killed and his coworker, Joshua Garza, 19, was seriously injured.
Authorities said the suspect then drove to Lowell in Lake County, Ind., where he shot a farmer, Keith Dahl, 64. Dahl, who was shot several times, is recovering.
"Guy going around killing people? (An arrest)'s always a relief... You could be one of those random people," said Khammyyi Mussa, resident.
"I seen a couple of days ago they were doing the manhunts. It's great they got him. It's awesome," said Larry Williams, resident.
The gunman had conversations-- asking the construction workers about building materials and the farmer about raising honeybees-- before shooting, according to the surviving victims.
A funeral will be held for Alonso on Friday and Saturday at Memory Lanes in Schererville, Ind. His body will be buried in Guadalajara, Mexico.