This article presents a slippery slope argument against the legalization of assisted suicide. The core of the argument is that legalization of physician-assisted suicide will result in a number of actions contributing to widespread belief that suicide is a duty in a variety of common circumstances. The essay contends that widespread belief is a good reason to be cautious about the legalization of physician-assisted suicide. Characteristics of good slippery slope arguments, limitations of slippery slope arguments, and possible counterarguments to the argument are all considered in this essay. (55 refs)