Corporal Eugene Cole was killed around 1:45 a.m.in Norridgewock, located about 30 miles north of the state capital of Augusta, Somerset County Sheriff Dale Lancaster announced.
This undated identification photo released by Maine State Police shows John Williams of Madison, Maine, who is being sought in connection with the shooting of a Somerset County sheriff's deputy very early Wednesday morning, April 25, 2018, in Norridgewock, Me.
John Williams is suspected of killing a ME sheriff's deputy.
State police on Wednesday were also staking out a house in Madison believed to be the home where the alleged killer lived with his girlfriend.
John Williams is on the loose, and state police said he now believed to be on foot and is "armed and risky".
Aircraft and armored vehicles were seen around Norridgewock, and schools were locked down as federal, state and local law enforcement officials searched for 29-year-old John Williams, of Madison, Maine, who remained on the loose after abandoning the stolen cruiser, state police said.
Williams has been described by police as 5-foot 6-inches tall, weighing about 120 pounds, with brown hair shaved on the sides with a ponytail on the top of his head.
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NEW: A Haverhill District Court Clerk in MA confirmed to TV5 that Williams was scheduled to appear Wednesday for a probable cause hearing on an illegal firearm charge stemming from an arrest back in March.
ME records didn't indicate a lengthy criminal record. State police there issued a nationwide alert on the search.
Cole's cruiser was found around 5 a.m. on Martin Stream Road in Norridgewock.
Paul LePage is ordering flags lowered in honor of a deputy killed in the line of duty.
Williams posted bail at 5:10 a.m. on March 31 and was scheduled to appear in court for a probable cause hearing Wednesday.
Bobby Bishop says he is a neighbor of John Williams.
The last ME law enforcement officer to die in a shooting was Giles Landry. He is Maine's 84th law enforcement line of duty death. Landry, a state police trooper, was responding to a domestic dispute call.