(Updated: 9:55 a.m.)
NBC canceled long running procedural "Law & Order" after twenty seasons, the network announced on Friday.
""The full measure of the collective contributions made by Dick Wolf and his ‘Law & Order’ franchise over the last two decades to the success of NBC and Universal Media Studios cannot be overstated," Jeff Gaspin, chairman, NBC Universal Television Entertainment, said in a statement.
Previously
NBC is in last-minute talks over a 21st season of "Law & Order," despite that news of its cancellation had spread among people on the production side Thursday, a person with direct knowledge of the ongoing negotiations told TheWrap.
The production-side person told TheWrap unequivocally that the May 24 "Law & Order" episode would be its last, leaving it tied with "Gunsmoke" as the longest-running scripted show in U.S. primetime history.

They don’t have much time: This season’s final episode airs May 24, and NBC is presenting its upfronts in New York on Monday. It’s conceivable that a deal could be done after that, though this would present complications for the network in selling advertising for the show.
NBC prime-time entertainment boss Angela Bromstadhad earlier indicated her desire to see the venerable crime procedural break the longevity record, but the business dynamics of keeping "L&O" v. 1.0 on the air have become more cumbersome.
The show has been averaging between a 1.5-1.7 rating in the adults 18-49 demo; respectable for its time slot, but way down from the Dick Wolf-produced series’ heyday.
Further pushing "Law & Order" to the brink: TNT’s off-network syndication commitment of 20 seasons is expiring after this season. Though it has built its "We Know Drama" brand on the "L&O" franchise, it has plenty of its own originally-produced hourlongs to fill its schedule now.
New York Magazine’s Vulture blog reported that NBC had offered producer Dick Wolf a 21st season, but with a reduced budget and limited episodes. The New York Times, citing two sources it did not identify, said Wolf and NBC were still in talks.
If "Law & Order" exits, it will do so with over 400 episodes in the can … and as a pioneer of the procedural model that continues to dominate prime-time schedules.