[quote=CreedTheChimera]
She couldn't be locked up. There was no motive and could be charted up as an accident.
[/quote]

Bullshit. The amount of morphine in a person's blood can easily be tested. Combined with the fact that each of the cases was contolled by her, and whatever method she used to ensure that the people's blood wasn't tested during these incidents, there'd be a strong case. Furthermore, he could easily have captured an image of the woman. Forensics isn't stupid, and there are plenty of ways to discover the truth. Getting away with murder is harder than you'd think from what movies and series tell you.