The name of the Israelite who was slain with the Midianite woman was Zimri son of Salu, the leader of a Simeonite family.
Jewish Publication Society of America Version (JPS1917) - Numbers 25:14 >Now the name of the man of Israel that was slain, who was slain with the Midianitish woman, was Zimri, the son of Salu, a prince of a fathers' house among the Simeonites.