No, Apache storm is not dead. It is still used by many top companies for real-time big data analytics with fault-tolerance and fast data processing. Some of the companies like Groupon, The Weather Channel, FullContact, Twitter, Yahoo, Spotify, Rubicon Project, Alibaba, etc.
In case you are interested in learning Apache storm, you can enroll this Apache Storm training by Intellipaat.
You can watch this video on Apache Storm to know how efficient and important is Apache Storm: