This was an actual 1911 court case in the Netherlands.
A man called Willem Markus catches the suspect, Johannes Beek, stealing city money. Markus reports Beek, who is fired. Beek bakes a cake full of rat poison (arsenic) and sends it to the Markus home. Markus doesn't eat it, but his wife does, and she dies.
Beek is tried for murder of the wife. Defense argues that Beek did not intend to kill the wife, only the husband. No intent means no murder; it's manslaughter at most.
