The reason is the cyanide, she shot him after to make sure he died.

Great story! I loved the ending :)

I liked it! Your story was written in a humerous way, although I had to read it over a few times to get it. To make it better, you should introduce Calvin before you have him talk. Also, you never said that the main character shot Calvin the first time, although I made a pretty good assumption. But still, it's important for you to make what's happing clear to the reader. I like your style of writing, but if you want to get away with a short story like this you have to spend some time describing the setting, why he was there, and who is who. I don't think you should completely re-write, but you should add to it and make a bit better.