Michigan Wolverines 2020 three-star quarterback commit JD Johnson announced his medical retirement from football on Wednesday.

He shared the news on his Twitter account:

ArizonaVarsity.com offered a shorter version of Johnson’s announcement:

As the above Tweet notes, Johnson is a product of Pinnacle High School in Phoenix, Arizona, the same school that Michigan State redshirt senior quarterback Brian Lewerke graduated from.

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Committing to Michigan shortly before Christmas last year, Johnson was considered one of the top-20 pro-style quarterbacks in the cycle.

Sans Johnson, the Wolverines’ 2020 class now stands at 23 members – and without a quarterback commit. Headlined by Lincoln-Way East (Frankfort, Illinois) four-star wide receiver A.J. Henning, Michigan’s class ranks No. 9 nationally and No. 2 in the B1G.

Coming off a 31-point victory over the Notre Dame Fighting Irish, the Wolverines will travel to College Park to face the Maryland Terrapins (3-5) on Saturday at 12:00PM ET on ABC.