Justin Hartley's Tracker has dealt with numerous surprise cast exits - so who is and isn't returning for season 4? The hit CBS series, which premiered in February 2024, introduced fictional survivalist Colter (Hartley) as he travels the country to help solve various missing persons cases. The ensemble cast grew with characters such as handlers Teddi (Robin Weigert) and Velma (Abby McEnany), hacker Bobby (Eric Graise) and attorney Reenie (Fiona Rene). Weigert's character was written off and McEnany and Graise soon followed. "I do think it's evolving.