A brother whom I once regarded as a close friend turned out to have been molesting one of his stepdaughters from age 7 to age 12.
This only came to light some twenty-odd years later, when he was taken to court, convicted and sentenced to six years in prison. (By then I had broken with the JWs, and learned about this from a newspaper report).
The scariest thing for me was that while we were close friends, my two daughters were still only children. At least he never got his filthy paws on them !