Dallas Cowboys Mackey was signed as an
undrafted free agent by the
Dallas Cowboys after the
2001 NFL draft, following a rookie minicamp tryout on August 10. He was released before the season started and signed to the
practice squad. He was promoted to the active roster on November 17. He played in only one game against the
Philadelphia Eagles, before being placed on the
injured reserve list with a fractured tibia plateau on November 21. After being released on August 28,
2002, he was signed to the team's
practice squad on September 11. On September 13, he was promoted to the active roster and would proceed to lead the team in
special teams tackles with 18, while making 3 defensive tackles and one fumble recovery. He was waived on August 17,
2003.
Montreal Alouettes (CFL) After working as a substitute teacher for three years, he attended a tryout and was signed as a
free agent by the
Montreal Alouettes in May
2006. Wearing jersey number 39, he appeared in 10 games, starting four and splitting time at
middle linebacker with
Dwayne Taylor, while registering 18 total tackles. ==References==