Matt Decker

Commodore Matt Decker was freaking awesome. He was a Starfleet commander who went off his nut after witnessing a big metal tadpole kill his entire crew. Man, did he go out with a bang. (TOS: "A Stargram to a Gentleman in the Country, from his friend on Rigel: giving an authentick and circumstantial account of the confinement, behaviour, and death of Commodore Decker, as attested by the gentlemen who were present").
:Decker was played by the doctor from "Murder, She Wrote".