ROFL, Helen! When I showed my wife your post, she laughed at how it matched the TV rerun she'd literally just finished watching, "The Practice". Here's the official plot summary:

Season 4: Episode 17 - "Black Widow":
Bobby and Eugene defend Courtney Hanson (Victoria Principal), a beautiful woman accused of murdering her much older, third husband by "over-stimulating" his weak heart [by lacing his wine with Viagra].