Cynics and philosophers will say you can never really know someone, and while that seems like a bleak prescription, there are definitely cases where it's true.
Some people are so good at keeping secrets, those closest to them don't know the full story until after they pass away. Finding out you didn't truly know the character of a loved one can be a huge jolt, particularly when you're already dealing with the complexities of grief. But in some cases, a disturbing reveal empowers you to move on from the half-truths you were fed.
In a popular Reddit thread, people shared the most disturbing things they've found out about loved ones after they died, and the secrets run deep and wide.
My uncle killed himself after he was caught at a bestiality brothel in Nevada. Course we only found out why he killed himself when the police showed up at my parents house wanting to know if he had any pets at home. He did not.