Despite online efforts to keep the show alive, "Constantine" won't be back for a second season.

Executive producer Daniel Cerone wrote an extended message to fans, posted on Twitter over the weekend, announcing that the show's cast and crew are being released from their contracts. The show ended its 13-episode first and only season on NBC in February, and although it was reported that Cerone pitched the show to other networks including Fox and The CW, the producer said that the efforts to save the supernatural series didn't work out.

On Sunday, June 7, Cerone tweeted, "I promised I'd share news when I had it—sadly, the news is not good...The studio tried to find a new home for the show, for which we're forever grateful, but those efforts didn't pan out. I'm sorry, I wasn't provided any information on the attempts to sell the show elsewhere. All I can report is that the show is now over."

When the Matt Ryan starrer premiered to low ratings and failed to get a back nine order during its first season, fans of "Constantine" immediately sensed that the show was in trouble and showed their support for the series on social media. Cerone took part in the online effort to keep hope for the show alive, updating fans when he heard of any movement on the show's future. He also joined a Twitter effort that campaigned for "Constantine" to be picked up by The CW, since the network was already home to two DC Comics-based dramas. The online campaign saw fans and "Constantine" stars live-tweeting episodes, which were streaming on Hulu, and even celebrity fans such as "Arrow'" star Stephen Amell declared their support for the show.

In his message, Cerone thanked fans for their continued support and assured them that Constantine's adventures will live on in many other ways.

"You all deserve many years of the series we set out to make, and we're disappointed that we couldn't deliver that to you. The good news is that Constantine will live on for years in many more forms. But our time as caretakers has ended," he wrote.