Laporin

From Memory Alpha, the free Star Trek reference.

Captain Laporin was a Benzenite Starfleet officer who served as a starship captain during the Federation-Klingon War (2372-73). While attending Starfleet Academy, one of Laporin's classmates was future fellow Starfleet captain, Benjamin Sisko.

In late-2372, the Klingons boarded Laporin's starship during a bloody skirmish. The boarding party was merciless to Laporin's crew, as Laporin would witness a Klingon behead his Tellarite helmsman. Moments later, the same Klingon would tear off Laporin's breathing device, killing the captain.

In 2373, Captain Benjamin Sisko would learn of Laporin's fate while on the Klingon outpost, Ty'Gokor, as told by the Klingon soldier who committed it. (DS9: "Apocalypse Rising")