He was assassinated on the way ( in Arcadia ) by Thersites and Onchestus .
Later , Oeneus passed the kingdom to his son - in - law , Andraemon , and headed to Argos to meet Diomedes .
Diomedes was assassinated on the way ( in Arcadia ) by Thersites and Onchestus .
Later , Oeneus passed the kingdom to his son - in - law , Andraemon , and headed to Argos to meet Diomedes .