Police say the stepmother of a 5-year-old boy missing since February led a private investigator to a body that detectives believe is the missing child.

Wichita Police Chief Gordon Ramsay said at a news conference Friday that Emily Glass showed David Marshburn where the remains were hidden, under a bridge on a gravel road in Sedgwick, about 20 miles north of Wichita.

Ramsay says Marshburn contacted police. Police retrieved the body and arrested Glass on Thursday.

Ramsay says police believe the body is that of Lucas Hernandez.

Glass is being held on suspicion of interfering with a law enforcement officer and obstruction.

The stepmother reported Lucas missing Feb. 17, saying she fell asleep after a shower and woke up to find him missing. She has not been charged in his disappearance.

Glass was acquitted in May of a child endangerment charge after authorities say she smoked marijuana before driving with her 1-year-old daughter in the car.

The boy’s father, Jonathan Hernandez, was not at home when his son disappeared.