He played college football for the Oregon State Beavers and was signed by the St. Louis Rams as an undrafted free agent in 2012.

[3] He was the starting quarterback and punter of the Cougars football team during his senior year, leading them to a State Championship game, which they lost.

[7] Hekker ranked third-best in career-punt yardage in school history with a solid 41.3 yards average per punt.

Hekker earned Pac-12 Conference Honorable Mention with 87 career punts downed inside the 20-yard line in 2011.

[12] Two weeks later against the Seattle Seahawks, Hekker threw a 2-yard touchdown pass to wide receiver Danny Amendola on a fake field goal.

[15][16] In doing so, he stopped Patrick Peterson from returning a punt for a touchdown against St. Louis, as he did in both rivalry games last season.

[20] On December 29, 2013, Hekker officially broke the single season record for net punt yards (44.2), previously held by Andy Lee (44) in 2006 for the San Francisco 49ers.

[23][24] On October 19, 2014, Hekker threw a pass to running back Benny Cunningham on a fake punt with 1:14 left in a game against the Seahawks.

[29] On December 27, 2015, early in the second quarter of a game against the Seahawks, Hekker was penalized 15 yards for unnecessary roughness for shoving Cliff Avril after a 45-yard punt.

[30][31] In the 2015 season, Hekker again led the league in net punting average[32] and was named as an All-Pro by the Associated Press for the second time.

[39] During Week 2 against the Washington Redskins, Hekker recorded a 28-yard pass to Josh Reynolds on a successful fake punt.

[44] In his playoff debut, Hekker had five punts for 218 net yards for a 43.6 average in the 26–13 loss to the Atlanta Falcons in the Wild Card Round.

[49] In the playoffs, the Rams defeated both the Dallas Cowboys in the Divisional Round and Saints in the NFC Championship.

[52][53] During Week 10 against the Pittsburgh Steelers, Hekker threw a pass on a fake punt that was intercepted by running back Trey Edmunds in the 17–12 road loss.

[57] During Week 7 against the Chicago Bears, Hekker punted five times and each one was downed at or inside the opposing 10-yard line.

He averaged 44.2 yards per punt with a long of 63 in the Rams' 24–10 victory on Monday Night Football, earning NFC Special Teams Player of the Week for the fourth time in his career.

[63] He won Super Bowl LVI when the Rams defeated the Cincinnati Bengals by a score of 23–20 and punted six times for 261 yards in the game.

[71] In 2018 Hekker appeared on the Netflix cooking show Nailed It as a guest judge for season 2 episode 3, titled "Tailgate, Failgate.