A 9-year-old was found dead and stuffed into a duffel bag in Oregon. Police arrested her mother and her mother's girlfriend a year later.

Oregon police worked for almost a year to solve the murder of a 9-year-old who was found stuffed into a duffel bag and left near a rest stop on the Oregon coast. They arrested the girl's mother and the mother's girlfriend on Tuesday.

The remains were discovered in Lincoln County in Dec. 2020. Investigators estimated that she had died between 30 and 60 days before her remains were found.

"It was very difficult to identify who the child was," said Captain Stephanie Bigman to KGW-TV. She said that more than 150 tips did not help the investigation, and they were afraid it would turn into a cold case with no suspects.

Then, through the use of DNA evidence and genealogy databases, police were able to identify the girl as Haley Mae Coblentz in October.

"As a law enforcement officer, you're horrified, and really just want to do everything you can to find those who are responsible for this," said Bigman.

Police were able to locate the girl's biological mother with the help of the FBI. On Tuesday, law enforcement officials arrested Shawna Browning (29) and her girlfriend Lauren Harrison (34) at a traffic stop in Detroit, Michigan.

Police say that Haley had been born in Colorado but had been travelling with Browning and Harrison in the Pacific Northwest since 2015.

Investigators say that the girl had never been reported missing by her mother or the mother's girlfriend.

The couple are being held without bail in Wayne County awaiting extradition to Oregon. Both are charged with aggravated murder.

Here's a local news report about the heinous incident:

Two arrested after OSP identifies remains found in Lincoln County in 2020 as 9-year-old girlwww.youtube.com