Actually, there are many morbid sites like that, some of them can be reached by links directly from Rotten.com, others can be found with google (or the search engine of your choice) searches for "death pics" or searches along those lines...
You have to keep in mind, that the particularly lighthearted nature of Rotten.com is rather unique, but with a little diligence, you should be able to find some other sites that offer much the same content, with possibly an even darker humor than rotten has...
...Good luck, I guess... I rather rapidly burned myself out on such content, but I understand that there is a reasonable amount of fascination with such things, so I hope you find what you are looking for...
You have to keep in mind, that the particularly lighthearted nature of Rotten.com is rather unique, but with a little diligence, you should be able to find some other sites that offer much the same content, with possibly an even darker humor than rotten has...
...Good luck, I guess... I rather rapidly burned myself out on such content, but I understand that there is a reasonable amount of fascination with such things, so I hope you find what you are looking for...