Alcatraz had it's own morgue but no autopsies were performed there. All deceased inmates were brought back to the mainland and released to the San Francisco County Coroner.
Alcatraz - Military morgue
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By kjfitz @ 2007-11-23 10:22:11
"The highest number ever recorded was 302, and the lowest number 222. The average number of inmates during the 29 years of service was around 260. There were approximately 1545 total men imprisoned there and the NPS indicated that while 1,576 number were issued, over thirty convicts were returned to Alcatraz with different numbers issued."
Those are very small numbers for a Federal Prison.