Why did Israel iz died?

It seems there might be a misunderstanding or a typo in your question, as there is no widely known individual named "Israel Iz" associated with a notable event. If you're referring to Israel Kamakawiwo'ole, the Hawaiian musician, he passed away in 1997 due to health complications related to obesity and respiratory issues. His music, particularly his rendition of "Somewhere Over the Rainbow," continues to resonate with many people worldwide. Please clarify if you meant someone else or if you need more specific information!