Did sargent Johnson die in halo?

Sgt Johnson died in Halo 3(last level) by the monitors laser after he tried to activateHALO (they activated the broken HALO from HALO 1 so they can destroy the Ark-activates all the HALO's). Masterchief got lasered twice short and Arbiter got lasered once long. Eventually Masterchief killed the monitor and activated HALO. He left Sgt Johnson to die because Sgt Johnson wanted to. Masterchief and Arbiter escaped in a Warthog and Drove to the Frigate.