FOND DU LAC -- 9-year-old Lisa Ann French's murder on Halloween is the reason why trick-or-treating hours changed in Wisconsin.
The crime was so heinous, the press called Gerald Turner 'The Halloween Killer' back in 1973.
Gerald turner sexually assaulted, murdered and dumped French's body in a farm field.
She knocked on Turner's door alone on Halloween dressed up as a hobo.
45 years later, the crime is still seared in Fond du Lac parent's minds. Jim Lemke remembers the frantic search for Lisa.
"We had an old building behind our house an old garage at the time and they were searching that. Nothing like that ever happened in Fond du Lac before," said Lemke.
Fond du Lac Police require trick-or-treating to be done on the weekend and during the daylight from 2:30 to 5:30 p.m. The goal is to make the day safer.
"Parents need to know where their children are going set time limits as to how long they can be out," said Steve Klein, Fond du Lac Police.
The people of Fond du Lac are determined this will never happen again.