Not very many murders go unsolved when a police officer is shot, especially when he is shot inside his own station. On May 7, 1988, 21 year old rookie cop Steve Sandlin was alone in the Mountainair New Mexico police station when his life was brought to an end. The apparent fatal gunshot to Steve's head appeared to have been fired from his own weapon, his police issued .375 magnum which was found laying beside him.
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Sources:
http://trailwentcold.com/2018/04/11/the-trail-went-cold-episode-67-steve-sandlin/
https://unsolved.com/gallery/steve-sandlin/
http://unsolvedmysteries.wikia.com/wiki/Steve_Sandlin
https://www.abqjournal.com/201338/officers-death-still-a-mystery-after-25-years-2.html