State Sen. Bruce Caswell announced he will not seek re-election later this year.
The 64-year-old Caswell said his tenure will end Dec. 31. He took over the position from Cameron Brown starting in January 2011.
Caswell, a retired superintendent of Pittsford Area Schools, had turned in his petition to run again. However, Caswell said he will withdraw his petition and let someone new step in to the seat.
The 16th State Senate District will be redrawn in 2015 to exclude St. Joseph and Lenawee counties, but add Jackson County. It currently includes and will continue to take in Branch and Hillsdale counties.