ASU football: Bo Graham, son of Todd, resigns as Arizona State running backs coach; replaced by Josh Martin

The Arizona St. Sun Devils will have to scramble to replace their running backs coach two weeks before the season begins. Thayer Evans of Sports Illustrated reports that Todd Graham's son Bo is resigning from ASU after serving as the team's RB coach the past three years. He is resigning for personal reasons. Graham has also deleted his Twitter account.

Bo seemed really enthusiastic about this season only a few weeks ago, so this is coming right out of the blue.

Here is a Q&A @NickPKrueger did with Bo Graham just days ago, where Graham said how excited he was for the season https://t.co/d2GDaAMQ7O

— Devils Digest (@DevilsDigest) August 24, 2015

Bo also served as the team's on-campus recruiting director, so Arizona State will have to work through that as well. ASU's running backs have always been on the solid side: D.J. Foster has been good all three years, and Marion Grice, Deantre Lewis and Demario Richard are all in the mix.

Graham has coached with his father as the running backs coach in Tulsa in 2007 and 2008 and was a student assistant coach with the Hurricanes when Todd was the defensive coordinator from 2003 to 2005. Graham was also a coach in 2011 at Pitt with his father as head graduate assistant and was the team's assistant wide receivers coach.

UPDATE: Josh Martin will be the new Arizona State running backs coach. He served as an offensive graduate assistant working with the offensive line.

The program is likely to replace from within the organization rather than look from the outside to find a new head coach. Expect an internal promotion pretty soon.