'Law & Order' Season 23 - 4 Cast Members Return, 2 Leaving, 2 New Stars Join the Cast!

Law & Order is back in action.

The long-running NBC series originally ended back in 2010 after 20 seasons, but the network decided to reboot the show years later.

Season 23 premiered on Thursday ,January 18 at 8 p.m. ET on NBC, and there have already been some major casting changes.

Click through to see who returned and who is leaving for Law & Order Season 23…