Here's my own photo of the memorials plaque.
As you can see, quite a legend has been built up around the incident. In case you didn't notice, that's South Park creator Trey Parker as Alferd Packer in Cannibal: The Musical. And though Ravenous was probably inspired as much by Indian legend as Al Packer, Robert Carlyle's character is clearly modeled after Packer. There is quite a lot of information about Al Packer (and what became of him) online, as well as images, songs, recipes and what have you. Here's the Wiki just to get you started on the whole fascinating story.