Question: why did clytemnestra kill cassandra?
Answer: Probably because Cassandra had been taken as a concubine by her husband, King Agamemnon of Mycenae. In his absence, Clytemnestra began a love affair with her husband's rival, Aegisthus, and they slew Cassandra and her children with Agamemnon to seize the throne. Cassandra was probably buried in Mycenae.