Myr-lo was a First Born scientist living in Kamtol. He was one of only two people that knew the location of the Nerve Index Machine. Myr-lo is responsible for maintaining the machine, but he does not have the same knowledge about it the original inventor had. So although Myr-lo can repair small damage to the machine, he can never build a new one.
Myr-lo is killed by John Carter when the latter sets out to destroy the master machine. Carter did not like the fact that he had to kill the inventor. He had hoped Myr-lo was at a banquet organized by Doxus and that the master machine would be unguarded. When confronted by Carter, Myr-lo tried to grab his radium pistol, thus going against the usual ethics of battle since Carter himself only has a sword. Carter kills him before he can shoot however.