Richard "The Iceman" Kuklinski did away with over 200 people working for the mob and was described by his daughter as a generous father.
"If Dad was filming, he wanted everyone to smile. We learned to take advantage of the happy moments ... He denied us nothing. He wanted his life to be like it was on television. He just didn't know how to get there."
However, he had a temper, and would abuse his wife and even hurt family pets.
"I was late at coming home once, and he took Princess and broke her neck. Princess was a Samoyed, not a small dog. He said I would never be late again, and I wasn't."
He also made his daughter help with body disposals.
"There were times when he would tell me not to look in the back seat or in the trunk, and I would drive him to some garage and pop the trunk, looking straight forward as he told me to do, while he would unload whatever it was."
His daughter is most haunted by the idea that maybe he could have been helped before it was too late.
"What haunts me most is the reality that my father was a very, very sick, demented man. Between his own background as an abused child and the experiences that shaped his adulthood, the die was cast.
Maybe if he'd gotten treatment, some or all of this could have been prevented. That thought haunts me every day."
"The Bus Stop Killer" Levi Bellfield's daughters weren't surprised to learn their dad was a monster.
"One time Levi came and smashed our windows, and we all sat together in the bedroom trying to comfort each other.
I remember the curtains of my sisters' bedroom being set alight.
Another time, he threw paint at our door. He had tried to run away, but he'd trod in the paint so we could see his footprints going down to the end of the road."
The girls also paid for the sins of their father, as locals abused them.
"People would walk up to us and shout "murderer" to our faces, like it was our fault. Hannah got beaten up at school by three boys who locked her in a cupboard and gave her black eyes and a swollen nose.
Whenever we complained to the teachers, it was us who were taken out of class, not the people who had done it."
The two want nothing to do with him.
"I hope he rots in hell. I know it sounds harsh, but I really do. I don't ever want to see him again."