20/20 S2018E42: The DNA Detective
- Aired: 2018-10-05
- Time: 22:00:00
- Runtime: 60 minutes
Overview
Teacher's gruesome 1992 death launches decades-long mystery; Pennsylvania teacher's 1992 death grows cold.
Teacher's gruesome 1992 death launches decades-long mystery; Pennsylvania teacher's 1992 death grows cold.