I think it's funny that Majestic and Spartan are (or were) good friends but Majestic has killed him a number of times.
He killed him in Team One (when he was still flesh and blood) in order to stop Daemonites.
He killed him decades later when an evil part of him that survived the previous killing became Kaizen Gamorra.
He killed him (now as a robot) when he had Void powers in order to reset the universe when Daemonites had taken over.
He killed him after World's End when the Wildcats came to see what he was doing in Hawaii (but he had a backup body).
I'm pretty sure he killed him some other times but I can't remember at the moment.
I think Spartan killed him twice back though. Actually one time he only thought he was dead (and Majestic came back to kill him, it was the universe-resetting time), but the other time was at the end of the universe and that time it helped Majestic ascend to Spartan's level of godhood.