A couple has been indicted on accusations that they murdered their deaf teenage son and then burned down their house to cover up the crime, the Associated Press reported.

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According to the Chenango County Sheriff’s Office in New York, Ernest F. Franklin II, 35, and his wife, Heather Franklin, 33, of Guilford, New York, were charged with second-degree murder, arson and tampering with physical evidence.

The two were indicted Friday on charges of second-degree murder in the death of their adopted son, 16-year-old Jeffrey Franklin, People magazine reported.

Following an investigation of a fire on March 1 at the family’s 1,300-square-foot home, the couple was arrested. Investigators believe they set fire to their home to cover up the killing of their son. An autopsy determined he died prior to the fire, according to the sheriff’s office.

Local law authorities have not said how or when the boy was killed.

The Franklins got married in 2011 and adopted Jeffrey six or seven years ago, the sheriff’s office said. According to People magazine, Ernest is an Iraq War veteran. Heather wrote in posts on her Facebook page that she is pregnant.

The Franklins are being held without bail. They entered a plea of not guilty.

“People are asking themselves, ‘How could this happen?'” Chenango County Sheriff Ernest Cutting Jr. told People magazine. “Certainly for the public here, it’s a mix of anger and frustration and disappointment.”

Just days before Heather Franklin was arrested, she posted an update on her Facebook page about how much she missed her son, who she called JR. She also informed friends and family that she and her husband had added their “needs” and “wants” to the CheckedTwice.com Family Gift Registry because they lost everything in the fire.

A GoFundMe page was also established, but it has been taken down.

The Associated Press reported that police who responded to a 911 call about 1:15 a.m. on March 1 found the Franklin’s house, located about an hour away from Syracuse, engulfed in flames. Jeffrey was inside and unable to escape the fire, according to the sheriff’s office.

Authorities initially said the cause of the fire appeared to be a wood stove, the residence’s main heating source.

“People are wondering how anybody could do something so brutal to a developmentally disabled and handicapped 16-year-old boy,” Cutting told People. “There are a lot of people who would have taken him. There are organizations that would have taken care of him. Why resort to that? … It’s just a terrible, terrible tragedy.”