|Height: 6.00||Born: Nassau, BS|
|Weight: 233||College: Saint Mary's|
|Birthdate: 1987-11-29||Years: 5 CGY / 5 CFL|
McCartney was selected in the fifth round (37th overall) of the 2010 CFL Canadian Draft and signed on May 20, 2010.
McCartney played 18 games and had one tackle and led the team with 23 special-teams tackles which ranked him third in the CFL. He played in the Western Final and had two special-teams tackles. He also played in the Grey Cup registering one special-teams tackle.
McCartney played in 11 games and had 11 defensive tackles, including a tackle for loss, a sack, a fumble recovery, 14 special-teams tackles and a knockdown. He was placed on the one-game injury list for Games 8-14. McCartney was on the reserve list for the Western Final.
McCartney played in all 18 regular-season games, both playoff contests and the Grey Cup. Once again a standout on special teams, McCartney led the team for a second time in his career as he made 23 special-teams tackles. The total was a personal best and landed him third in the league. He also had nine tackles and a sack on defence. In the post-season, he totaled six special-teams tackles.
In his second league season, McCartney was limited by injury to seven regular-season appearances as well as the West semifinal. Slowed by injuries during the middle portion of the season, McCartney still managed to top his previous total with 13 tackles while also tying for second on the squad with three tackles for loss. He added two special-teams tackles.
In his rookie campaign, McCartney was a force on special teams as he led the Stampeders with 19 special-teams tackles. He recorded at least one special-teams in 16 of the 17 regular-season games in which he was in uniform. He made an impressive CFL debut against Toronto on July 1 as he recorded his first tackle, his first sack and his first special-teams tackle. He finished the season with eight defensive tackles, including one tackle for loss.
McCartney played at Wilfrid Laurier in 2006. He then transferred to Saint Mary’s, where he played the 2008 and 2009 seasons. He was an Atlantic University Sport conference all-star in 2008 when he recorded 21 tackles, including 7.5 tackles for loss, four sacks, two forced fumbles and two fumble recoveries. During the 2008 season, he blocked a punt and ran it back 60 yards for a touchdown to lead Saint Mary's to a comeback win over St. Francis Xavier. In 2009, McCartney recorded 3.5 sacks, five tackles for loss and one forced fumble. He was invited to the 2009 CIS East-West Bowl.
In his youth, McCartney established national age-group swimming records in his native Bahamas and later moved to Canada to continue his training. He spent this past off-season working for his family’s tire/car battery shop in Nassau. In February, Karl hosted a full-combine in Nassau as a way to assist Bahamian athletes. Coaches and scouts from Canada and the US were in attendance and Bahamian football players were given opportunities to get scholarships.