Died of cancer at age 53. Ciro Santilli just can't help but speculate that it is linked to radioactivity exposure.
This dude mentored Fermi in high school. Added some info at: en.wikipedia.org/w/index.php?title=Enrico_Fermi&type=revision&diff=1050919447&oldid=1049187703 from Enrico Fermi: physicist by Emilio Segrè (1970).
Biography of Enrico Fermi by fellow physicist, free rent on the on the Internet Archive: archive.org/details/enricofermiphysi0000segr