It has been reported by an author on Buzzfeed that the NBC series Constantine was indeed canceled. Posted in an articled dated April 13th, Kate Aurthur listed the series based on the popular DC Comics character as one of the shows that will not be returning for a second season. That report flew in direct contradiction of what showrunner Daniel Cerone had stated via a tweet on 28 Mar 2015, where he noted the following:

If you think you have heard all the exciting news about SDCC 2014, you have not heard what NBC and Universal Television have planned! They are packing the show with panels, stars parties and more from top trending shows “Constantine,” “The Blacklist,” “Hannibal,” “Grimm,” “Bates Motel” and even bringing Triumph the Insult Comic Dog to share secrets with fans. Ready to read what is in store for attendees? All the info is below: