Andrews was captured alive by a Legion raiding party and was brought back to the Fort to fight in the arena. Before the Courier arrives, Andrews has already been challenged once and survived.
Playstation 3Xbox 360 When exiting Caesar's tent after killing Andrews in the arena, his corpse may launch hundreds of feet up out of the arena and come crashing down somewhere nearby. [verified]
PCXbox 360The machete that Andrews carries is marked as a quest item and, thus, if it is picked up, it cannot be dropped.[verified]