Ernesti fought him using Ikaruga and absolutely dominated him. His death was on his own flagship in a fit of hysteria after having a battle with Ernesti Echevalier and losing dramatically. The result of this was him blowing multiple holes through his flagship and it's engine while laughing like a maniac. This ended up killing him and everyone on that ship except for Ernesti, who easily flew away. You could classify this as a suicide/mass homicide. His final words were "Damn you, demon. I'll make sure you pay for this in hell!", immediately after he said those words he was crushed inside his mech by the impact of the ship hitting the ground.