April 25: Modesto teen disappears, case goes unsolved for nearly 40 years

Plus: the unsolved murder of a college student hitchhiker in Northern California, a serial killing husband, and more.

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1968: Robert Weeks starts a (probable) serial-killing career

The tale seems sad but familiar: a mom of young children goes missing after a nasty divorce, and suspicion falls on the husband. But as the years went by, things got a lot more sinister.