The woman told police her 18-year-old daughter had placed the online ad. She said a man — using the name “David” — called about watching his autistic son, “Alex.” Police reported the caller described the son as 19 and said he still wears diapers, drinks formula from a bottle and uses a pacifier.

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Police now believe the caller was Richardson. The woman chose to baby-sit “Alex” instead of letting her daughter.

The woman reported “Alex” first arrived at the house in a taxi at 2 one morning and stood on the porch saying “4121” over and over. The number is the start of the family’s street address.

He had $40 and a typed note from “David” that he needed to be fed, according to a police report of her interview. He was wearing a soiled diaper and very old clothes. He also had a backpack with diapers, ointment, a bottle and a pacifier.

The woman said that on that first night she changed his diaper and got him clean clothes.

She said she read him a bedtime story because he kicked and screamed when she put him in bed.

She said she gave him a bottle with baby formula which he drank “with a straight face.” She later gave him a bottle of Kool-Aid.

She reported that during most stays he would not be still when she changed his diapers.

“He would get up and run around the house. She would have to catch him to finish putting his diaper back on,” police reported.

“Looking back on everything now, knowing he was not autistic while she was wiping him and cleaning him up completely disgusts her,” police reported. “She believed initially she was caring for an autistic person, but he was actually someone using her to get stimulated.”