If it's not affraid of people, maybe you can run at it with a pointy stick or knife and do the deed cave-man style. [>:]
Somebody obviously has a "relationship" <?> with that deer and would be heartbroke if it didn't come back for it's next feeding <or whatever>. I personally wouldn't shoot it for 2 reasons.
1. Where is the sport in shooting a deer that is not wild / has no fear of humans / sense of danger?
2. I have morals not to purposly hurt other peoples feelings. IE: Shooting a deer that they have the joy of having personal contact with.
Just my opinion. We all are entitled to our own.