The 6-foot-5 Long, who is from suburban Oklahoma City, averaged just 1.9 points in 9.5 minutes over 22 games this past season despite ample opportunities to earn his way into a thin rotation.
Iowa State will also add three highly-touted freshman guards as freshmen next season and Virginia transfer Marial Shayok, a shooting guard like Long, will be eligible next winter.
The Cyclones finished 13-18 this season and missed the NCAA Tournament after six consecutive appearances. Coach Steve Prohm announced the transfer Tuesday.
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