If you were to speculate, based on the film series alone...

I speculate that Jason's father was a no-good, violent alcoholic who frequently beat his son and wife. Pamela Voorhees (Jason's mother), demonstrating her psychotic abilities for the first time ever, probably chopped up her husband into pieces and then buried his remains deep in the woods of Camp Chrystal Lake.

I would have Pamela Voorhees as an unscrupulous nurse and Jason's father a hulking, mentally handicapped patient with a bone disorder and no family who is terrified of her despite his size. She takes advantage of and becomes pregnant by him and after discovery is then stricken from the profession and kicked out of the hospital quietly as they don't want the negative publicity.

After that, she raises Jason herself and eventually it's on to Crystal Lake.


I definitely wouldn't have Mrs Voorhees as any kind of initial victim.

Have him be a prisoned murderer. It would come full circle on the mythos of the Voorhees family.