SHERMAN, Texas (KTEN) — Grayson County Commissioners have approved a grant request to fund further investigation in a cold case.

It's now been more than a decade since the the bodies of Brian Ritchie, Misty Ballou, and expecting mother Cassandra Ballou were found murdered in their burning mobile home on Reynolds Lane in Sherman on September 20, 2010. 

"Even though it's unsolved, it's a cold case, we're not giving up on it," Chief Deputy Tony Bennie said.

The Grayson County Sheriff's Office is applying for an $18,800 grant to cover the costs of sending DNA evidence samples to an outside lab for testing with new technology. That money will come from Season of Justice, a non-profit focused on funding investigations into cold cases.

"Any time that we feel like there's a possibility to leverage new technology toward a cold case, we keep our minds and our eyes open for that," Bennie said.

The sheriff's office hopes re-examination could provide a break in the case.  Capt. Martin Hall said they are determined to keep investigating, even after all these years.

"We had times where not all the evidence lines up or we didn't have enough evidence, or maybe this person wasn't available for an interview," Hall said. "There could've been any number of things where we just haven't been able to get it solved."

Investigators are sending 20 DNA samples for testing, each costing nearly $1,000.

Investigators say they've had several persons of interest over the years, but cannot give details lest they tip off the perpetrator.