Who unexpectedly arrived at the lifeboat? What did pi discover about the person? What happens to him?

Pi drifts out of consciousness, then hears a voice again, and returns to conversation. He realizes now that the voice is that of another man, a Frenchman, also blind, also in a lifeboat rowing beside him, also starving. Pi and the Frenchman manage to draw up next to each other, and the stranger climbs into Pi’s boat. He immediately dives on Pi and tries to kill him, with the intention of eating him, but the Frenchman is attacked and killed by Richard Parker.