Forensic Investigation Handbook

prosector:
The individual who is in charge of the actual dissection. In small hospitals, the prosector is a Board-certified pathologist, an MD or DO who has undergone a residency in the specialty of pathology, specifically anatomic pathology. In university-based hospitals with teaching programs, the prosector is a pathology resident (a physician who is training to be a pathologist) or a medical student taking an effective rotation in pathology.
https://books.google.ru/books?id=_VAqPHlW9SQC&pg=PA371&lpg=P...

North American
A person who dissects dead bodies for examination or anatomical demonstration.
https://en.oxforddictionaries.com/definition/prosector

One who dissects cadavers for anatomical instruction or pathological examination.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing

1. a person who dissects cadavers for the purpose of anatomical demonstration.
2. a person who performs autopsies.
http://www.thefreedictionary.com/prosector

- one who performs prosection.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc.

One who dissects cadavers for anatomical instruction or pathological examination.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company.

a person who, under the supervision of a pathologist, performs gross dissections and prepares autopsy specimens for pathological examination.
Mosby's Medical Dictionary, 9th edition. © 2009, Elsevier.
http://medical-dictionary.thefreedictionary.com/prosector

Usage examples:

Clinical Autopsy vs Medicolegal Autopsy
...The consent so obtained is provided to the prosector by the hospital administrator along-with the letter ordering autopsy. ... Official letter from the commanding officer of the military hospital to the prosector asking him to carry out the autopsy. ... It is mandatory that the order has to be in writing to avoid future legal complications for the prosector.

Prosector

Clinical autopsy is performed by a qualified pathologist holding at least a post graduate diploma. A medical graduate is not considered qualified to carry out a clinical autopsy. Although in AFMS, surgeons carry out clinical autopsies in the absence of a pathologist, it is not a correct practice as many gross findings are missed while performing the autopsy.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4925615/

Ref. also to: https://www.google.ru/#newwindow=1&tbs=li:1&q=forensic exami...