Horror movie where man gets cancer and goes camping

I’m trying to find the name of a horror movie where a man gets cancer and decides to go camping to live out the rest of his life. He breaks into a cabin to steal alcohol (I think). I think he has a yellow jacket. Something keeps messing with his stuff and he thinks it’s a bear. But it ends up being a man in a red jacket who is stalking him. The man reaches through tent during the middle of the night and it’s super creepy. Movie ends with main character face down on a riverbank. We don’t know if he’s alive or dead. The movie doesn’t answer any questions about the man in the red jacket. Please help if you can! I’ve been looking for this movie for years