Casen Calmus is a defensive back for the Oklahoma Sooners listed at 5'10" and 195 pounds. The Brentwood, Tennessee native prepped at Brentwood Academy, where he competed in three sports. On offense, he caught nine passes for 84 yards and a touchdown. Defensively, he recorded one interception he returned for a 63-yard touchdown, along with seven pass breakups, 4.5 tackles for loss, and one sack. He also handled special teams duties, returning 14 punts for 102 yards. Calmus enrolled at Oklahoma in summer 2023 and redshirted that season. He made the SEC Fall Academic Honor Roll in 2024 and 2025. The redshirt junior is majoring in management.