What early Teen Titans comic had a witchcraft story on an isolated island?

I had this comic in the 70's, which featured the Teen Titans. It was a really spooky one as it was set on a cut-off island. I think there was a mansion belonging to one of the female superhero's relative, an aunt possibly. The story’s theme was Witchcraft.

There was a cat that got garrotted, a gold star that had to be fired up to the sun and some wild demonic dogs. I think perhaps the aunt may have been possessed by the spirit of a dead witch, and the life of the female Teen Titan was at stake as she would be the next to be possessed.