Black Widow Part 2 l 20/20

WATCH THE FULL EPISODE OF 20/20: https://bit.ly/2GEtsZB

Detectives take closer look at man's mysterious death by antifreeze

When investigators started questioning how David Castor really died and if someone else was responsible, they learned his wife Stacey Castor's first husband was also dead.

READ MORE – Timeline of ‘Black Widow’ Stacey Castor’s shocking crimes: https://abcn.ws/2DUny4r