Kevin Costner

The popular television western "Yellowstone" with Kevin Costner will end this fall and be replaced almost immediately by a sequel. But like any good drama, there's some mystery involved.

The sequel, still untitled, will premiere December on the Paramount cable network, which also televises "Yellowstone," Paramount said on May 5.

Kevin Costner and his wife of over 18 years Christine Baumgartner have announced they are going their separate ways.

In a statement shared with CNN on May 2, Costner's representative Arnold Robinson said that "circumstances beyond his control have transpired which have resulted in Mr. Costner having to participate in a dissolution of marriage action."