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MUSKEGON, Mich. (UDPATE 10:30AM/Wednesday) - Norton Shores Police tell WZZM 13's Jon Mills that Charles Byer has died from his wounds.

NORTON SHORES, Mich.(WZZM) -- Investigators say the man who held them off at gunpoint for several hours before turning his gun on himself is in critical condition at a Muskegon hospital.

Police went to the home of Charles Byer, 51, on Lake Harbor Drive Tuesday after receiving a call from family members concerned for his safety. Officers determined Byer, who has a 2010 conviction for a sex offense, was wanted for probation violation after missing several appointments with his probation officer.

Shortly after officers arrivedat Byer's home around 10 a.m.,he walked out into his yard with a handgun. They say Byer ignored their demands to put down the weapon. Byer eventually walked several hundred yards away and sat next to a shed.

Negotiators had spent more than two and a half hours talking with Byer, trying to get him to surrender, when officers heard a single shot. They found him withwhat they calla self-inflictedgunshot wound to his head.

Byer was in intensive care around 6 p.m. Tuesday night.

In 2010, Byer was convicted in Allegan County of attempted second-degree criminal sexual conduct involving a victim under the age of 13. He is listed in the Michigan Sex Offender Registry.