Looking for a older horror movie title...?

Ok I dont even know if anyone has seen it maybe Im strange LOL. Its about a fat woman, and shes a murderer. I thought it was like Fat Kathy or something like that but I cant find that title. Its a crazy movie, I was just wanting the name!
Update: No its not misery...ty for that though :)
Update 2: LOL I have SEEN misery yall it's not that! LOL I must be the only one who has seen it...I swear it was Fat _______ I think I just dont know the name! I cant find anything on it myself :( Maybe Im crazy lmao
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