Blackmon made the announcement Monday on his Twitter account, thanking fans for their support.
— James Blackmon Jr. (@JBlackmon2) May 8, 2017
As a junior last season, he averaged 17.0 points, led the Big Ten in 3-pointers made per game (3.0) and was a third-team all-conference selection.
Blackmon becomes the third underclassmen to leave the Hoosiers since new coach Archie Miller was hired in March. Forward OG Anunoby and center Thomas Bryant, both sophomores, also have hired agents and will stay in the draft.