One of your posts reminded me of a possible sociopath on reality television right now: Janelle Pierzina, who will probably be evicted from Big Brother tomorrow. A few episodes ago, she admitted she didn't cry during labor and doesn't at funerals. I didn't watch her previous seasons religiously (she got 3rd place twice), but she is a ruthless physical competitor and never shows empathy for her enemies in the house. Her competitors have finally figured her out, though--one had a confessional in a recent episode about Janelle's not having feelings being an advantage in the game--sounds like sociopathy to me!
Some good stuff is from 11:00-12:00 in this video.