“Nobody dreamed that the daughter was going to kill her mother,” he says. PEOPLE has not been able to reach the Gilbert family for comment. But soon after Mari’s death, daughter Sherre ...

After Mari Gilbert pushed authorities to investigate the disappearance of her daughter Shannan Gilbert in 2010, the search led officials to the bodies of several homicide victims in Long Island.

Mari Gilbert made it her sole purpose to find her daughter and fight for justice for all the other women. Since the majority of women had worked as escorts and disappeared during appointments or ...