Movie like Misery but with younger guy

I may get some details wrong but here’s what I remember of the movie. I believe the main character guy who was a teenager or young man was somehow injured and a woman brings him into her home and starts caring for him but keeps him held hostage in her dead sons room. At one point I believe she tries to bury him alive in the backyard.

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That Cold Day in the Park (1969)?

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Inside?

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