This guide explains the main cast changes on Law & Order and Law & Order: Special Victims Unit, why they happen, and how they fit into the long-running franchise.
As an evergreen reference, it focuses on verified cast timelines, behind-the-scenes reasons for turnover, and practical context for viewers trying to understand shift in the detectives, DAs, and recurring figures across seasons.
Whether you are catching up on the franchise or researching cast turnover patterns, this overview answers what changed, when it changed, and why it matters for each series.
