He was 82.
His death, which occurred last week, was announced on Monday, March 17 by WCBS.
Following 15 years with WNBC-TV, Diaz spent 12 years at CBS New York.
A native of Puerto Rico, Diaz relocated to upper Manhattan during his childhood. He earned a master's degree from Columbia after graduating from City College and Fordham Prep.
In a video tribute to Diaz, CBS Evening News co-anchor Maurice Dubois described Diaz as "a reporter's reporter," and a quintessential New York City who sought to uplift others.
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