: Jane Curtin, Tawny Cypress, and Dallas Roberts left the main cast, though Roberts made guest appearances. Skeet Ulrich joined as Carrie’s mysterious husband, Eddie Martin, a role originally played by Michael Dempsey. Season 4 Plot Highlights
: The romantic tension between Carrie and Al remained a central theme, though they prioritized their professional relationship. Unforgettable - Season 4
The fourth season of marked a major turning point for the series, characterized by a move to a new network and a significant cast overhaul . Originally a CBS procedural, the show was picked up by A&E for its final 13-episode run after being canceled by its original network twice. Production and Network Transition : Jane Curtin, Tawny Cypress, and Dallas Roberts
: New detective Denny Padilla was introduced with a clear interest in Carrie, creating friction with Al. Final Cancellation The fourth season of marked a major turning
Due to the gap in production, many original actors' contracts had lapsed, leading to a substantial "revamp" of the supporting cast.
: Plots ranged from investigating high-stakes video game corporate espionage to a cold case involving con artists and a secret aerospace engineering mission.
Despite its "death-defying" history, the series was officially canceled for the third and final time on February 16, 2016, shortly after the Season 4 finale aired. A&E opted not to order a fifth season, and unlike previous cancellations, no further efforts were made to find a new home for the show.