Jaden Hullaby, a former football player at both New Mexico and Texas, has tragically passed away at just 21 years old, both schools announced Monday on social media.

Hullaby’s family couldn’t “track any of his devices,” according to a relative who wrote on social media on Sunday that he had been missing since Friday.” He was last seen in Dallas, and the cause of his passing is still unknown.

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In an update on Monday, Hullaby’s brother, Landon, announced the UNM athlete had sadly passed away. “Forever living through you big brudda,” Landon wrote. “I love you so much and I got you and the family forever I swear get your rest King.”

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Hullaby played both tight end and running back for New Mexico during the 2022 season. In 2020, Texas recruited him, and that season, he played in two games there. He transferred from Texas after redshirting there in 2021.

Longhorns head coach Steve Sarkisian, who briefly coached Hullaby during his time in Austin, released a statement on his passing on Monday afternoon.

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“It’s such devastating and tragic news to hear of Jaden’s passing,” Sarkisian said. “He was a great person and someone we all enjoyed being around, coaching and spending time with. All of our thoughts are with his family, friends and teammates, and we want to send our deepest condolences to them in such a difficult time.”

Dallas native Hullaby attended Bishop Dunne High School in Dallas as a junior in high school and won a state championship there. He also graduated from Mansfield Timberview High School.

In addition to 59 yards on 13 carries, he caught two passes for New Mexico last season for a total of 44 yards. After the 2022 campaign at UNM, he entered the transfer portal.