Thriller movie: young policeman with motorbike vs. farmer serial killer [closed]

I'm looking for a movie I saw as a child over 30 years ago and I was barely paying attention.

The story was centered around disappearances of a number people over years, perhaps decades. It was set in a small town. The kind of place where it would be otherwise be great to raise a family and live the quiet life except of course there is a serial killer near. The killer lived on the outskirts of the same locality. I remember there were 4 perhaps 5 chapters to this story and each of them was a different era of the killer doing his nasty deeds.

I distinctly remember one of his victims being a young police officer. The officer rode a police motorbike. At some point the young officer figured out that the "farmer Joe" type serial killer was in fact A KILLER. I think the officer was visiting the killers' farm when he came across one of many burial sites the killer used to dispose of his victims. Unfortunately, the officer, and his cool motorbike, ended up in one such grave on the same property.

Finally, somehow the burial sites were discovered. There were A LOT of burial sites. What I don't remember is if the killer died a ripe old man or was arrested and jailed as a ripe old man.