He died after battling a cancer known as multiple myeloma.
Diaz retired in 2022 after a 50-year career in television journalism.
He was one of the original television news consumer watchdogs. He would often try to uncover and confront rip-off artists.
"Shame on You" was his signature work for many years on CBS New York, a consumer investigative journalism program.
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He worked for several different stations and programs throughout his career including 20/20.
Diaz won more the 40 Emmy Awards.
He leaves behind his wife, Shawn, his three children and twin grandsons.
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