Former Iowa and Buffalo Bills offensive lineman Kyle Calloway was killed after he was struck by a train on Saturday while jogging in Arizona.
The 29-year-old former football player was hit from behind by the train, according to The Gazette.
Calloway started 37 of 38 games for Iowa before he was snagged as a sixth-round pick by the Buffalo Bills in 2010.
His family is donating his brain to CTE research.
