JMU's Monday press conference Withers would only say he was out for W&M this Sat (JMU then has a bye week before @ UD on 11/14).
Now its official as of this afternoon..

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Ends his career:
Georgia Tech:
2012: Passing: 596 yds, 4 TDs, 3 INTs. Rushing: 544 yds, 9 Tds
2013: Passing: 1,561 yds, 15 TDs, 13 INTs. Rushing: 513 yds, 8 TDs (7-6 as a starter).
JMU: (16-5 as a starter).
2014 (13 games): Passing: 282 of 465 (61%), 3,462 yds, 30 TDs, 7 INT. Rushing: 826 yds, 9 TDs. 3rd Team AP All American, 4th in Payton voting.
2015 (8 games): Passing 164 of 240 (68%), 2,190 yds, 21 TDs, 10 INT. Rushing: 814 yds, 8 TDs.
Against Richmond he was phenomenal with 418 yds of total offense in 3+ quarters till he went down:
19 of 32 passing for 294 yds, 2 TDs, 0 INT, rushing 14 carries for 124 yds, 3 TDs.
If he didn't get hurt was likely going to be a 500+ yd, 7 TD record breaking performance as JMU's backup came in and ran for a TD and threw for a TD.