Heinicke signed a contract with the St. Louis BattleHawks of the XFL on Friday, Kevin Seifert of ESPN.com reports.
The 26-year-old appeared in six games for the Panthers last season but was unable to earn a spot on the 53-man roster this season, as Kyle Allen and rookie Will Grier worked as the backup options to the now-injured Cam Newton (foot). Heinicke completed 35 of 57 passes for 320 yards with one touchdown and three interceptions in 2018, but he'll now have a chance to showcase himself in the new iteration of the XFL.