Jim Pex, former criminalist with the Oregon State Police Crime Detection Lab, explains how he used dolls and strings to help the 1983 investigation into whether Downs herself shot her three children.
SUBSCRIBE to ABC NEWS: https://www.youtube.com/ABCNews/
Watch More on http://abcnews.go.com/
LIKE ABC News on FACEBOOK
https://www.facebook.com/abcnews
FOLLOW ABC News on TWITTER:
https://twitter.com/abc
GOOD MORNING AMERICA’S HOMEPAGE:
https://www.goodmorningamerica.com/