Mitchell, a native of Plano, Texas, de-committed from the school after his brother Mike, a former football player at Ohio State, transferred to Texas Tech.
The 6-foot-7 Mitchell is rated the No. 91 player in the country by Rivals.
Ohio State's 2015 class now has four players, including four-star guard Austin Grandstaff, four-star center Daniel Giddens and four-star point guard A.J. Harris.
- Scooby Axson