Killing the mouse was more difficult than I thought. With our previous problem, I just bought a few of the basic, traditional traps, laid them where we saw the mice and---bang, bang---no more mice. What I've since learned is that the basic Victor mouse trap comes in two different styles. And, there's an even better trap available if you're willing to pay a few bucks more. Here's a picture of the three different types:
On the left is the one I bought recently. It's difficult to set and doesn't work very well because when it's set, the metal bar is applying pressure to a metal hook. A good bit of pressure is required to set it off. Our mouse licked the peanut butter off three of these without setting off a single one. The middle trap is similar in style, but uses a plastic hook. The rod slides off more easily and it's easier to hook on something solid like a piece of beef jerky (as shown) which the mouse would have to tug on to get off. But, my favorite is the one on the right (the Ortho Press 'N Set Mouse Trap) which is the one that got our mouse. You put the peanut butter in the center white cup and pull the lever back. The mouse can't get to the peanut butter without stepping on the red trip which sets off the trap. The mouse was dead 30 minutes after I laid the trap. Winner!