This is an old article, but someone (I forget who) linked to it on my Facebook feed this morning and I was riveted. John Reed at Vice writes about his grandmother, who he suspected of poisoning those around her, including family members: What Do You Do When You Think You Have a Murderer in the Family?
I think it hit home because my Grandma Loomis was an amazing cook (unlike Reed's grandmother). But when we got drowsy from eating her cooking, it was because it was so good we stuffed ourselves, not because she was poisoning us. But the writer in me immediately made the connection - a character whose food is so good that not only do people not realize she's poisoning them, but she's the last person anyone would suspect!
All joking aside, that's got to be a tough burden to carry, the idea that someone you love may have been a killer - and may have caused the death of your unborn child. Usually when I see these stories it's because the murderer was arrested and convicted, and it's all out in the open. In this case, grandma may really have gotten away with murder and that there's nothing he could do about it by the time he figured it out seems to have left Reed without any much needed closure. It's a fascinating read, check it out.