Who killed Cain?

The books do not agree. Jubilees says Cain died in the same year as Adam when his house fell on him, and adds that he was killed by its stones because with a stone he had killed Abel.

Jasher says he was killed by Lamech, who was old and could not see and was being led in the field by his son Tubal Cain.

The Cave of Treasures tells the same kind of story with more detail. Lamech, a blind man of Cain's own line, shoots an arrow that strikes Cain between the eyes in the forest of Nod, having taken his movement for a wild beast, and then strikes and kills the youth who guided his arm. The book keeps this Lamech apart from Lamech the father of Noah.

The Testament of Benjamin has no killer at all. Cain is handed over to seven vengeances, one plague for every hundred years, and is brought to desolation at the Flood.