GREENE TOWNSHIP, Pa. -- After an investigation led by Pennsylvania state police, the FBI and the district attorney's office, authorities have announced that charges will be filed in the death of a 4-year-old child found dead after an extensive search near Hookstown, Beaver County, Pa, about 30 minutes from Weirton, W.Va.

Wyatt Smitsky, of Greene Township, Pa., who was reported missing since Friday afternoon, was discovered in the septic tank of a neighboring house Saturday morning.

State police announced in a press conference on Saturday that they have questioned family and neighbors of the boy. An attorney for the boy's father said that his client was released from police custody and he has not been charged at this time. NEWS9 has learned that the boys grandmother lived in Weirton and recently relocated to the Hookstown area.

Police have not named a specific person, but they did say that someone will be charged with homicide following the conclusion of an autopsy scheduled for 9 a.m. Sunday.

Wyatt was last seen at about 5:30 p.m. Friday. State police originally thought the boy might have walked away from his home along Georgetown Road and got lost.

The young boy, according to police, had a congenital heart defect and required medication, prompting an all-out search. Almost 200 emergency personnel and volunteers searched dense woods with the help of dogs until 3 a.m. Saturday. The search resumed at about 11:30 a.m. until authorities uncovered the boy's body.

After looking throughout the neighborhood, authorities decided to look more closely at the area immediately surrounding the boy's house. A Beaver County hazmat team entered the septic tank on an adjoining property and found the four-year-old inside.

His exact cause of his death has not been determined, but police do not believe Wyatt Smitsky could have uncovered the lid to the septic tank by himself.