Was John brown a Martyr or a Murdurer

I think John Brown was a martyr because he fought for what was right. He thought that he was the chosen one from god. Even though he killed people, he was killing them because they were also doing something bad. John Brown got tried for treason, and got hanged on December 2nd, 1859. Before he died he wrote this letter: I, John Brown, am now quite certain that the crimes of this guilty land will never be purged away but with blood”. That means that we need a war to break this up.