Former Iowa Hawkeye running back Damon Bullock died unexpectedly Sunday. He was 25.

Bullock's Hawkeye football career lasted from 2011 to 2014.

UPDATE: Former Hawkeye running back Damon Bullock, 25, fatally hit by a car in Texas, police say

"With tears streaming down my face as I create this post I regretfully have to say that we lost our son Damon to a terrible accident this morning," Bullock's mother, Kimberly Handy, posted on Facebook, though she didn't elaborate on the details surrounding his death.

Bullock, of Mansfield, Texas, ranked 37th in program history for rushing yards, with 1,074, and among Big Ten running backs, he ranks fourth with 32 receptions, according to HawkeyeSports.com. In 2013 and 2014, he was named to the Earl Campbell Tyler Rose Award Watch List.

Former and current Hawkeye players quickly expressed condolences on Twitter Sunday.

"Know you in Heaven smiling down!" former hawkeye Miles Taylor Tweeted Sunday. "Can't imagine my time in Iowa without you bro."

"My heart is extremely heavy right now!" tweeted Christian Kirksey, a linebacker with the Cleveland Browns and former Hawkeye player. "I love you Damon Bullock! Rest in peace bro! ❤️"

Many of Bulock's Twitter admirers also began resurfacing a compilation of VINE videos he made with former Hawkeye Jordan Lomax in 2017.

“Our thoughts and prayers are with Damon’s parents, Kimberly and Roscoe, and the entire family," Iowa coach Kirk Ferentz said in a news release. "Damon’s tragic and unexpected death is a shock to all of us within the Iowa football program, as well as his former teammates. Damon was an outstanding young man and we enjoyed him being a part of the Hawkeye football program.”

Bullock’s best career game came in an 18-17 win over Northern Illinois at Soldier Field in Chicago. In his first career start, Bullock rushed 30 times for 150 yards, scoring the game-winning touchdown on a 23-yard run late in the fourth quarter.

Register reporter Anna Spoerre can be contacted at aspoerre@dmreg.com, 515-284-8387 or on Twitter at @annaspoerre.