People with that level of likely-PCP are dangerous. Non-lethal techniques do not work to stop them.
What the hell? At what point, and on what evidence, did you conclude that he was probably on PCP? You really seem to sort through a variety of possibilities and select the one that allows you to paint the dead person in as negative a light as you can... and then you treat that one possibility as if it is the only reasonable possible and you discard all others.
Irrational, violent behavior + naked, PCP should be high on your suspect list.