[VisualizeSmallerGovernment]

Get a squirt bottle. Every time your kitty murders something you didn't want it to, say "NO!!!" in a loud, firm voice and squirt the kitty in the face (on the mist setting is fine).

[SWAMPSNIPER]

I guess that depends on the cat, mine would kill Me in My sleep for the squirt bottle trick. Better to put a lid on the fish tank.
Never walk past My refrigerator without looking, if Dinky is up there, he is playing his puma pouncing on the deer game, and guess who gets to play the deer. Damned cat has watched too many PBS nature programs. I should have let him watch Sesame Street.

[cwiz24]

Get a squirt bottle. Every time your kitty murders something you didn't want it to, say "NO!!!" in a loud, firm voice and squirt the kitty in the face (on the mist setting is fine).

As far as punishing your cat for hunting (which I assume is what you were referring to?), this should not be done. Your cat has an instinct to hunt and no amount of scolding or punishing will stop him from doing so. Plus, hunting for a housecat is often a way for the cat to provide food to someone (you) he sees as lacking in hunting skills. It is a gesture of friendship and kindness on the part of your cat and should not be scolded.