"Mariah is believed to have pbaded away," the Onslow County Sheriff's Office said in a statement, although what happened to the girl after her mother put her in bed almost a week ago is still a mystery.
Earl Kimrey, 32, was detained on Saturday for more than $ 1 million at the Onslow County Detention Center after his arrest for hiding the death, obstruction of justice and other charges, according to the Office of the Onslow County Sheriff
Kimrey was described by authorities as the boyfriend of the girl's mother, who reported that Mariah disappeared Monday morning after putting her to bed at his Jacksonville home the night before.
"Due to the evidence gathered during the course of the investigation, it is believed that Mariah has pbaded away," the sheriff's office said. "At this time, Mariah's location is unknown, searches will now change to a recovery process."
The arrest warrant said that Kimrey obstructed justice by "removing Mariah Woods's body from the scene of his death, and hiding (the) death and body, knowing that (she) died from unnatural causes."  Kimrey allegedly "failed to notify a law enforcement authority of Mariah Woods' death, and secretly disposed of the body of the dead child," according to the order.
Kimrey's lawyer, Walter Paramore, did not immediately respond to a call for comment.
& # 39; She's my baby & # 39;
Mariah was last seen Sunday night when her mother, Kristy Woods, put the girl to bed, according to the sheriff's office. Woods reported that Mariah disappeared around 6 a.m. Monday, when an Amber Alert was issued.
More than 700 volunteers turned out Friday when the search for the missing girl moved into the area around a stream a few miles from their home, CNN affiliate WNCN reported.
Residents moved into action after Woods' public appeals for his "very sweet and loving girl" with blue eyes and long brown hair.
Mariah's family has been cooperating with investigators and additional charges could be filed in the case, authorities said.
Kimrey's arrest warrant also states that he stole two dressers from a Jacksonville home between 11 p.m. Sunday and 3:30 a.m. Monday. He is also charged with second-degree theft, felony theft and possession of stolen property, authorities said.