he had taken another man's wife and had the man killed.
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Hermes
Hermes
Aegisthus killed Agamemnon because he sought revenge for Agamemnon's father, Atreus, who had wronged Aegisthus' family in the past. Additionally, Aegisthus was also motivated by his desire to take Agamemnon's throne and power for himself.
Agamemnon's father, Atreus, displaced Aegisthus' father on the throne.
Aegisthus was the son of Thyestes and his daughter, Pelopia. He was Clytemnestra's lover, though she was married to Agamemnon, and helped her kill him.