It's possible that:
* This is a fictional character: There might be a character named Ed Masterson in a book, movie, or TV show.
* The name is misspelled: The correct spelling might be different, and a search using the correct spelling might yield results.
* The information is private: The person may be a real person, but their death information is not publicly known.
To get more information, you could try:
* Searching online: Use a search engine with different variations of the name and add details like location or profession if known.
* Checking obituaries: Search online obituary databases or local newspaper archives.
* Consulting genealogy websites: Websites like Ancestry.com might have records.
Please provide more context or details about Ed Masterson to help narrow down the search.