A week ago Otter burned out on the Scorcher. It'd make sense if it was some yellow-bellied rookie - but he's been a stalker many years. They say he was even on Strelok's team. And then all of a sudden...
Otter (Russian: Выдра / Vydra) was an experienced stalker, who was a subject of gossip among stalkers in S.T.A.L.K.E.R.: Shadow of Chernobyl.
Shadow of Chernobyl
Otter does not appear in the game, as he died one week before the events of Shadow of Chernobyl, although stalkers do gossip about him and some even mourn his loss. He appeared to be a respected and well-known veteran around the Zone, rumored to have even been a part of Strelok's Group, although nothing about him was ever mentioned by the known members of this group (those being Strelok, Ghost, Fang, Doctor and possibly Guide) nor was he mentioned in any of their documents. By all accounts, this could have just been a false rumor.