NBC ran for years on the Law & Order franchise. The Dick Wolf-created property expanded out into multiple spinoffs, including Law & Order: SVU and Law & Order: Criminal Intent. When that show started to wane and finally pare down to just SVU, Wolf created Chicago Fire for NBC which lead to multiple spinoffs including Chicago PD and Chicago Med. But one of those didn't go over very well: Chicago Justice. Now we learn that the Law & Order and Chicago franchises exist in the same universe as Philip Winchester's character, Peter Stone, is headed to New York.
Deadline is reporting that Winchester will be reprising his Chicago Justice character on Law & Order: SVU where Stone will be the new Assistant District Attorney. He will join the shows 19th season at around the midpoint. But the groundwork was already laid out, as the character is from New York and is the son of former ADA Benjamin Stone, who was on Law & Order for four years, played by Michael Moriarty. This shows the fluid nature of the Wolf franchises as Winchester started off on three episodes of Chicago PD.
NBC seems to really like Winchester, moving him to his fourth NBC series in a row after he starred in the failed The Player then guesting on PD before leading Chicago Justice and now SVU.
The precedent for this kind of move was set up a long time ago with Richard Belzer's character John Munch, who started off on Homicide: Life on the Street. The character was a major part of the crossovers between Homicide and Law & Order, and when the series ended after seven seasons, Munch joined Law & Order: SVU.