Fans of the USA Network’s unique science-fiction series, The 4400, have been waiting patiently to hear about the show’s return ever since the season four finale aired in September. Unfortunately, it doesn’t look like the series is coming back.

USA has yet to make an official announcement about the cancellation but The 4400’s creator and executive producer Scott Peters says that the show is indeed over. In a post on the show’s messageboard, Peters said, “It’s with great sadness that I pass along to you the information I’ve just received — The 4400 has been cancelled. We’ve had a great time bringing you this story and submersing you in the lives of all these incredible characters.”

Peters went on to say, “I just spoke to Joel [Gretsch] and we had a great talk about what we all accomplished and how much we’ll miss our family that is our crew and our cast… and our fans. But at least we got to go out with a bang! I had an awesome time directing the last episode. I think I got to make almost every single cast member cry (on camera). How much fun was that?!”

“So let me raise my metaphorical glass to you all and thank you for being so loyal and so dedicated. I wish we could go on forever, but the party has come to an end. Be well and on behalf of all of us at The 4400 — thank you, it’s been a pleasure.”

Actress Jacqueline McKenzie, who plays Diana Skouris, posted to fans on her MySpace page saying, “I know I speak for all the cast: We really appreciate the support and dedication of our fans! Thank you!”

Hopefully USA will produce a TV movie to wrap up the series’ loose threads. We’ll keep you posted so stay tuned!

UPDATE: USA’s Executive VP of Original Programming, Jeff Wachtel, has confirmed the cancellation.