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McKINNEY-- The police chief of the McKinney Police Department, who has been the center of controversy since being hired, will retire this week.

An e-mail from interim City Manager Tom Muehlenbeck said he accepted Chief Joe Williams' notice of retirement around 6:15 a.m.Monday.

Chief Williams said he will retire on Tuesday, July 1. Sources tell News 8 that there was an investigation involved, but no other details have been given.

Former McKinney City Manager Jason Gray resigned in February after his controversial firing of veteran Police Chief Doug Kowalski.

Gray promoted his then-deputy city manager, Williams, into the position -- angering many residents, who felt Gray should have held a nation-wide search for a new chief.

Muehlenbeck said in his e-mail he will move forward with selecting an acting chief of the police department.

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