The results of an autopsy done Tuesday to determine the cause of death for Celina Cass is expected soon, according to a New Hampshire law enforcement official.

Senior Assistant Attorney General Jane Young told CBS News that the results of Celina Cass' autopsy would be released either late Tuesday afternoon or early Tuesday evening in Concord.

Divers found the 11-year-old girl's body on around 10:30 a.m. on Monday in the Connecticut River, one week after she went missing. Cass was last seen in her Stewartstown home on the computer on the night of July 25.

The FBI has offered a $25,000 reward in the case.

"We have brought Celina home, not the way we wanted to bring her home," Young has said.

Young said that the case, which was classified as a missing persons case is now being investigated as a "suspicious death."

"Based on what we have seen visually, we are treating it as suspicious," Young told ABC.

Cass's father Adam Laro had pleaded for his daughter to return home safe. Upon receiving the news of her death, Laro told CNN he "can't see why somebody would want to do that to my daughter. That's the thing that puzzles me."