Missouri Highway Patrol Superintendent Ron Replogle will retire on May 1, Gov. Jay Nixon announced Wednesday.
The news came hours before the state legislature began its probe into the governor's handling of the unrest in Ferguson. The grand jury's decision not to indict former Officer Darren Wilson in the shooting death of Michael Brown touched off a violent night of rioting in Ferguson on Nov. 24.
But Nixon said the timing of the announcement and the hearing were not related.