It may depend on what we mean by "dead." I'm thinking hobbyists may still use just about anything just to tinker with things, but I don't think that's particularly interesting in this context. What's more interesting is whether it's still being used in a commercial context?
In a commercial context there's different stages of dying, right?
Terminally Ill - the programming language is descending down the TIOBE index and is being used for fewer and fewer new projects.
Dying - the programming language isn't being used at all for new projects but is still being used in existing deployments. Minor modifications may be made, but nothing requiring a significant effort.
Dead - the programming language isn't being used at all for new projects nor is it being used in existing deployments.
Using these terms, I don't know if there are any Dead languages, but if there were, I'd imagine it would be Basic from the 80s (Apple, Commodore, Atari) and UCSD Pascal. I'd love to know if I'm wrong or what other languages would be "Dead" in the way I've defined it.