Houston Texans On May 6, 2016, Mullaney went undrafted and signed with the
Houston Texans, but was waived on July 25, 2016.
Dallas Cowboys On August 16, 2016, Mullaney was signed by the
Dallas Cowboys, only to be waived on August 30, 2016.
Cleveland Browns On June 12, 2017, Mullaney was signed by the
Cleveland Browns. He was waived on September 1, 2017, during roster cutdowns.
Arizona Hotshots In 2018, Mullaney signed with the Arizona Hotshots for the 2019 season. The league ceased operations in April 2019.
DC Defenders During the
2020 XFL draft in October 2019, Mullaney was selected by the
DC Defenders in the open phase. He was placed on a reserve list before the start of the regular season and waived on February 18, 2020. ==References==