Sedyn Kyne was a Mandalorian Human of male gender during the Cold War period, situated on the planet Nal Hutta.
Kyne's activities involved collaboration with Tarro Blood, a well-known bounty hunter and mercenary who had the ambition to participate in and ultimately triumph in the Great Hunt, in spite of a previous unsuccessful try. When the mercenary engaged with Braden and Jory inside the Poison Pit, a cantina located in the town of Jiguuna, Kyne was present alongside Blood.
Following Blood's directive, Kyne carried out the execution of both individuals, with the expectation that their deaths would lead an upstart bounty hunter to remove themselves from the Great Hunt competition.
Subsequently, Kyne came across the Hunter himself on Nar Shaddaa, with the backing of Hedarr Soongh, who possessed knowledge of Blood's wrongdoings. Soongh compelled Kyne to engage in an equitable duel, which resulted in the Hunter fatally shooting him.