I’ve been trying to grow out the mustache part of my facial hair for probably close to 35 years. I’m quite sure that there are babies still in utero who have thicker mustaches than I do.
This does NOT involve a crime but I always found the death of Karen Wetterhahn fascinating.
She was a chemistry professor at Dartmouth who accidentally spilled a few drops of a mercury compound on a gloved hand and ended up dying from mercury poisoning a year later from the incident.
https://en.wikipedia.org/wiki/Karen_Wetterhahn#Accident_and_death
Similarly Janet Parker. How did she get smallpox and no one else did?
I have always been fascinated with the Alan Chmurny case:
Brilliant, successful, happily married Ph.D. biochemist develops an awkward middle-age crush on a younger colleague which turns into a sick, years-long stalking. He uses his authority in the company to forge personnel records to make it look like the colleague is pursuing him. He’s eventually caught and tried for attempted murder for putting mercury in the air vents of the colleague’s car.
In the courtroom, moments after being found guilty, Chmurny swallows a cyanide capsule and dies a day later.
The defendant’s widow kept insisting that her husband was innocent, which reminded me of the OP’s story. As did post #282.
(The link may have a paywall.)
As part of my job as an environmental engineer, I take a hazardous waste operations refresher course every year. Her unfortunate death is frequently brought up to this day as a cautionary reminder to carefully evaluate the material that a protective glove is made of as compared to the chemical you are dealing with.
In her case, it was determined after the fact that dimethylmercury (the supertoxic chemical she was working with) easily passes through latex gloves like she was wearing for protection.
