After nearly three decades, Mitchell retires from coaching staff

John Mitchell.Less than two weeks after Brian Flores took a defensive coordinator job elsewhere, the Steelers have another subtraction from the coaching staff.

After 29 seasons in Pittsburgh, assistant head coach John Mitchell has officially retired at the age of 71. He was the longest-tenured coach on the staff, and spent the past 50 seasons coaching at the college or professional level.

"I’m grateful to the Rooney family for the wonderful opportunity to coach and work for the Steelers for nearly 30 years," Mitchell said in a press release. "It was truly an honor. I’d also like to thank Coach [Mike] Tomlin for giving me the opportunity to stay with the franchise when Coach [Bill] Cowher…