This mourner was off-world when the Dramia II plague decimated the planet Dramia II. When he returned, he found that all of his family and friends had died. Senseless in his grief, he remained on Dramia II where he lived in desolation as a cave dweller.
In 2270, he observed a landing party consisting of Spock, Kirk and Demos arrive on the planet's surface. Fearful of outsiders, the mourner ran to his cave for protection. When followed by the landing party, and his cave discovered, he jump from an upper ledge and attacked Kirk, before being wrestled off by Spock. (TAS: "Albatross")
According to the script, this individual was described as a "Phantom-Like Figure," before finally revealing that "He is Dramen, in appearance; but, he is ragged, haunted."