A long while ago, before patch 1.1, I defeated the cyberpsycho of this mission, but I did not loot his item drops or the shard. I wanted to come back later after increasing my level so that the loot would have better stats. When I eventually came back to finish it, the corpse and the shard weren't there anymore. As it is now, I can't complete the mission. It was so long ago that reloading a save from that general period of time is just not worth it.