Mullen, most recently of the Dallas Cowboys, is a cousin of Ravens star quarterback Lamar Jackson.
A second-round pick by the then-Oakland Raiders in 2019, Mullen has played in 46 games over four seasons, but just 14 in the past two seasons with the Raiders, Arizona Cardinals and Cowboys.
Multiple injuries limited him to five games in 2021, and he was traded to Arizona ahead of the 2022 season. The Cardinals waived Mullen on Dec. 13 and Dallas claimed him off waivers the next day. He played in just one game for the Cowboys, making three tackles.