The Woeful Widow - S9.E7

Investigators find David Castor dead with a glass of bright green liquid nearby. His wife Stacey's fingerprints are on the glass and police locate a turkey baster in the garbage with David's DNA on the tip. They suspect Castor poisoned her husband. As evidence against her mounts, her daughter Ashley is found unconscious with a note proclaiming she killed David. Upon Ashley's recovery, Stacey is found to have poisoned both of them - and her first husband too.