NEW YORK (AP) — A civil rights probe into the death of a mentally ill black man who accidentally set off his emergency medical alert device and was fatally shot by a white suburban New York police officer who responded has been closed without charges.

Acting U.S. Attorney Joon Kim said in a statement Thursday there was insufficient evidence for criminal charges in the shooting of Kenneth Chamberlain.

The 68-year-old Chamberlain died after his November 2011 encounter with officers from the White Plains Police Department. His family says the shooting was racially motivated.

Kim's office opened an investigation after a state grand jury decided not to indict the officers involved.

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Kim notes in November 2016 a federal jury rejected claims brought by Chamberlain's family against White Plains and the officer who shot Chamberlain.