BYU suffered its first serious injury of fall football practice on opening day Thursday when promising freshman running back Hema Heimuli tore his Achilles tendon.

Heimuli, listed as a third-string fullback on the Cougars' depth chart, will be out for the season and may not be ready for spring practice, according to Val Hale of the BYU Sports Information office. This will be Heimuli's redshirt season.Hale said Heimuli was running a sweep during drills and pulled up lame. "It was just kind of a freak thing. Nobody touched him."

The tendon was repaired in surgery Thursday night.

Heimuli, a 6-foot-2, 200-pound former Provo High star, is the brother of former record-setting Cougar back Lakei Heimuli. After returning from a mission last spring, Heimuli was impressive in scrimmages.