Law & Order: SVU is returning tonight (Thursday, September 25) at 9 p.m ET on NBC , but not everyone is coming back.

The long-running procedural TV series centers around the detectives of the Special Victims Unit as they investigate and prosecute sex-based crimes, and has been on the air since 1999.

Ahead of the Season 27 premiere, here’s everything we know about who is and isn’t returning for the next season of SVU .

Click through to find out more about who is leaving the series…

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