Craig Ruttle/Associated Press
Oklahoma quarterback Kyler Murray announced Monday on Twitter that he is entering the N.F.L. draft.
It would be a thoroughly unremarkable development for a reigning Heisman Trophy winner like Murray — except last year Murray was drafted ninth overall in the Major League Baseball draft, and accepted a $4.66 million signing bonus with the Oakland Athletics under the expectation that this past season would be his last in a football uniform.
The he took the Oklahoma Sooners to the College Football Playoff and won the sport’s most prestigious individual award.
Murray’s announcement came on the last day that college underclassmen could officially enter the N.