20/20

Season 42 Episode 6: The DNA Detective

Teacher's gruesome 1992 death launches decades-long mystery; Pennsylvania teacher's 1992 death grows cold

Genre:

News , Documentary

Seasons:

28

Episodes:

747

Actor:

David Muir , Deborah Roberts

Quality:

HD

Status:

Returning Series

First Air:

1978

IMDb:

6.3