After going undrafted in the 2011 NFL Draft, Bighill signed as a free agent with the BC Lions of the Canadian Football League on May 31, 2011. Bighill had an impressive rookie season, playing an increased role as the season progressed. He played in 12 games, including the final seven regular season games, and the West Final and Grey Cup games. He led the club, and was ranked fourth overall in the CFL, with 22 special team tackles. Bighill began the 2012 CFL season by replacing Solomon Elimimian at middle linebacker for the Lions, after Elimimian was signed by the Minnesota Vikings. After assuming the starting linebacker role, Bighill went on to amass 104 tackles and 4 interceptions. Elimimian returned to the Lions midway through the season, but Bighill retained all of the playing time. He was named both a CFL West All-Star and a CFL All-Star for the 2012 season. Bighill and Elimimian both returned to the Lions linebacker core for the 2013 CFL season. Bighill suffered a sprained ankle and missed Week 3 and 4. He played in the 16 other regular season games, and the Lions' lone playoff game. Bighill put together a strong 2013 season, accumulating 92 tackles, 12 special teams tackles, 9 sacks, 1 interception and 3 fumble recoveries. In 2014, Bighill played in all but one of the 18 regular season games as well as one playoff game. He totalled 77 tackles, 12 special teams tackles, 6 sacks, 1 interception, and 1 fumble recovery. Following the season, Bighill's linebacker teammate, Solomon Elimimian, was named the leagues MOP, and both of them signed 3-year contract extensions on the same day. In Bighill's fifth season with the Lions he played in all but one game of the regular season, contributing a league leading 117 tackles. Following the season, Bighill was named the CFL's Top Defensive Player. Bighill continued his dominant play in the 2016 season finishing 3rd in the league in tackles and earning his fourth CFL All-Star award in the past five seasons. On December 9, 2016, the BC Lions granted Bighill a release as per the agreements in his contract which allows him to pursue an NFL contract up until January 27, 2017. If he is unable to sign an NFL contract by that date he will be back under contract with the BC Lions through the 2018 CFL season. Through six CFL seasons Bighill amassed 489 defensive tackles, 69 special teams tackles, 33 sacks, 8 interceptions, 8 forced fumbles and 1 defensive touchdown. Bighill had a workout with the New Orleans Saints on December 13, 2016.
New Orleans Saints
Bighill signed a future/reserve contract with the New Orleans Saints on January 4, 2017. Bighill drew strongly positive attention for his performance during the Saints training camp and preseason. He was waived on September 2, 2017, and was signed to the Saints' practice squad the next day. He was promoted to the active roster on September 11, 2017. He was released the following day, and re-signed to the practice squad on September 14, 2017. He was promoted back to the active roster on October 12, 2017. He was waived again on October 17, 2017, and re-signed to the practice squad. He was promoted back to the active roster on November 18, 2017. He was waived two days later and re-signed to the practice squad. He signed a reserve/future contract with the Saints on January 16, 2018 On May 14, 2018, Bighill asked for release from the New Orleans Saints and was waived.
Bighill signed a one-year deal with the Winnipeg Blue Bombers on May 19, 2018. Bighill finished the 2018 season as the Blue Bomber's nominee for Most Outstanding Player, was named to the CFL All-Star team, and was ultimately named the CFL's Most Outstanding Defensive Player. The Blue Bombers signed Bighill to a 3 year $750,000 contract extension in January 2019, making him the highest paid defensive player in the CFL. Bighill helped lead the defence for the Bombers as they defeated Hamilton 33-12 in the 107th Grey Cup, the game saw Bighill recover a fumble which led to an Andrew Harris touchdown. After the win Bighill said that "I've packed too many garbage bags. I only play this game to win championships. We're bringing it home to Winnipeg, it doesn't get any better than that."
Statistics
Personal life
Bighill was born with a bilateral cleft lip and palate. He is on the board of Toronto-based charity Making Faces, a charity dedicated to helping people cope with facial differences. His son Beau was also born with a bilateral cleft lip. After Wendy Williams mocked Joaquin Phoenix on her show in 2020 because of his cleft lip, Bighill relentlessly called her out and requested an apology. Williams did end up making an apology to Bighill on Twitter, as well as making two donations to cleft related charities and wished his son Beau good luck on his upcoming surgery.
