I'm going into this fight with a single EMP grenade, a stun gun and tranquilizer rifle, and a handgun as my only lethal weapon.

I've managed to use the EMP and the stun gun to lock him down and pump two clips of handgun ammo into his head at point blank. This seems to just tickle him a little bit, and he promptly kills me.

I've also tried to run-and-gun, using the pillars and barricades for cover, but I haven't been very successful at actually damaging him while trying to dodge his gun and grenades.

What strategy can I use to kill him without any high-powered lethal weapons?