Kyle Calloway, a former standout offensive lineman for Iowa, died after being hit by a train. He was 29.

Police in Arizona, where Calloway lived, believe he was jogging on the tracks when the train hit him from behind, Tuscon (Ariz.) News Now reported.

"We are all stunned and very saddened to hear of the tragic accident claiming the life of Kyle Calloway," Iowa coach Kirk Ferentz said in a statement. "Our heartfelt condolences and prayers go out to Kyle's family and to those who knew him. He was a valued and respected member of our program."

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Calloway, a second-team All-Big Ten selection in 2008 and '09, was drafted by Buffalo in the seventh round in 2010 but released in the preseason. His family told the Cedar Rapids Gazette it would donate his brain to the study of the effects of CTE.

Just seen the news of Kyle Calloway. We came in together in buffalo my thoughts and prayers with his family. R.I.P my dude

— Cj Spiller (@CJSPILLER) July 6, 2016

Smh. We got drafted the same year. RIP Kyle Calloway https://t.co/IvLzrygbjt

— Marcus Easley (@MarcusEasley) July 6, 2016

Deeply saddened to hear that my teammate Kyle Calloway has passed. Please send your prayers and love to his family and friends.

— Marvin McNutt (@McNutt7wr) July 5, 2016

Sad to hear about Kyle. He kicked ass on the field, he kicked my ass many times in practice and he made me better. Rest easy Hawk

— Pat Angerer (@PAngererUSA) July 5, 2016