However, it is important to note that:
* Different versions of the character exist: There are numerous variations of Betty Ross in different comic book series, some with different fates. For instance, in the 1990s, Betty was killed by a mysterious force in the "Hulk" series, but that version of the character was later revealed to be an imposter.
* The MCU has changed her story: In the Marvel Cinematic Universe, Betty Ross is portrayed as Bruce Banner's former fiancee. However, she hasn't been a major character in the films, and her current status is uncertain.
In summary, while Betty Ross is a recurring character in Marvel stories, there is no canonical death of the character. If you are interested in a specific version or story, it is important to clarify which one you are referring to.