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LOS ANGELES (AP) _ The truth may be out there but ``The X-Files'' won't be.

The television series about FBI agents tracking aliens and other unusual suspects will end its nine-year run on Fox in May with its 201st episode, the network said.

The decision to wrap up ``The X-Files,'' which became a signature show for Fox and turned David Duchovny and Gillian Anderson into stars, followed network discussions with creator Chris Carter.

``It's the ninth inning. We want to go out on top,'' Carter told the Hollywood trade paper Daily Variety. ``We wanted to go out as a strong show.''

In a statement: Fox Television Entertainment Group chairman Sandy Grushow said: ``We respect Chris' wishes to end the show this season.''

Duchovny bowed out of the series last season, leading to the introduction of new cast members Robert Patrick and Annabeth Gish as agents working with Dana Scully (Anderson).

``The X-Files'' will end with a two-part episode, written by Carter, which he promised will tie up loose ends. He'd welcome Duchovny's return for the finale, Carter said in Variety's Thursday edition.

The series' ratings had dropped this season, but Fox still sees life in Carter's eerie tales of conspiracies and otherworldly events: A second theatrical feature is planned.

The first film, ``The X-Files,'' was a 1998 box-office success.