A rogue killer cop confesses. A flasher draws scrutiny. A man rapes two elderly women. Are any of these potential suspects the Pillowcase Rapist? A new type of blood testing may carry the answer. It's the most significant clue yet in the case.

Show notes:

If you or somebody you know has been a victim of sexual violence, you can get confidential support from the National Sexual Assault Hotline. Find them online at RAINN.org. Or call the toll-free number at 1-800-656-HOPE (4673).

To report tips about the cases featured in any of our episodes, contact the FBI's anonymous tip line at 1-800-CALL-FBI (225-5324) or visit FBI.gov.

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