Sanchez
Doctor Sanchez was a 23rd century Human Starfleet medical examiner who served aboard the  under Captain James T. Kirk during the mid-2260s. 

In 2268, Dr. Sanchez conducted an autopsy on Ensign Wyatt after he was killed by .
Dr. M'Benga revealed that Sanchez discovered that the cause of death was cellular disruption – as if "each  had been individually blasted from the inside", and ruled out a pathogen as the cause of this disruption. ()

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Humans
Starfleet sciences personnel
USS Enterprise (NCC-1701) personnel
Medical practitioners