Career
He played college football at Brigham Young University. He signed as an undrafted free agent with the Washington Redskins in 2015. In 2010, Mahina earned letterman honors at Brigham Young as a Freshman.
He saw action in 12 games and started in 5 of those games.
He had 11 receptions for 118 yards, with his season best game coming at Utah, where he caught 2 passes for 32 yards. Also, had 2 catches for 20 yards against UTEP in the 2010 New Mexico Bowl.
During 2011, Mahina redshirtted due to a neck injury. In 2012, Mahina played in nine games.
He caught eight passes for 128 yards and two touchdowns.
His first collegiate career touchdown came at home against Hawaii, was a 12 yard reception. Mahina caught 2 passes for 24 yards and 1 touchdown against #10 ranked Oregon State. In 2013, Mahina played in 10 games, starting 1, and had 7 receptions for 64 yards.
His best year came in 2014, as a senior.
He recorded a career-best 244 receiving yards and 20 receptions to finish his career with 46 receptions for 554 yards and 5 touchdowns. He caught 3 touchdown passes and had at least 1 reception in 11 of the 13 games, he played in and started all 13 games.
He totaled a career-high 54 receiving yards on 2 receptions in the 2014, inaugural, Miami Beach Bowl, including a career-long 41 yard reception. Mahina was also invited to and played in the 2015 NFLPA Collegiate Bowl postseason all-star game (2 catches, 20 yards), and the prestigious 2015 Senior Bowl postseason all-star game.
Washington Redskins
After going undrafted in the 2015 NFL Draft, Mahina was signed by the Washington Redskins on May 2, 2015.
He was waived on August 31.