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Sinfjötli (Fitela in Anglo-Saxon) was born of incest between Sigmund and Signy when she was desperate to conceive a child tough enough to avenge the murder of their father and brothers. He and his father did avenge them, but also harried and grew rich - and became werwolves from stealing the furs of a group of úlfheðnir. Eventually they came to Húnaland, where Sigmund became king and married Borghild, by whom he had two sons. Borghild hated Sinfjötli and tried three times to poison him. The first two times, Sigmund drank it instead, because he was invulnerable to poison, but the third time he momentarily forgot that Sinfjötli was not, and hastily told him to just drink it - he did and died.
Sigmund took Sinfjötli's corpse down to the fjord, where a ferryman was waiting. The ferryman said he could only take one passenger at a time and took the corpse first; out on the water, Sigmund saw them both disappear as they went to Valhalla, because the ferryman was Óðinn in disguise. Sigmund went home and divorced Borghild.
Sigmund took Sinfjötli's corpse down to the fjord, where a ferryman was waiting. The ferryman said he could only take one passenger at a time and took the corpse first; out on the water, Sigmund saw them both disappear as they went to Valhalla, because the ferryman was Óðinn in disguise. Sigmund went home and divorced Borghild.