PIKESVILLE, Md. (WJZ)—Investigators say the main suspect in the murder of a Pikesville elderly couple is their own grandson.

Monique Griego has the latest on the investigation and where Mathew Long was found.

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After several days of searching, police were able to track him down in Oklahoma. While there are still a lot of questions in the case, investigators may never be able to interview Long.

On Monday, Baltimore County police swarmed the quiet Pikesville neighborhood after Vaughn Pepper, 87, and his wife Marjorie, 85, are found murdered inside their home on Olmstead Road.

Now investigators say their live-in grandson is the main suspect in the case.

“Very sad, very sad. The couple was very giving to the community,” said Richard Davis, neighbor.

“To hear of something of this magnitude is pretty tragic,” said another neighbor.

Immediately after the bodies were found, police began looking for Mathew Long, 31, but did not officially call him a suspect until Friday after detectives tracked him down in Oklahoma.

“We received a phone call from the police in Oklahoma on Sept. 11, notifying us that he had been located there and was being transported to a local hospital for medical treatment,”  said Corp. Cathy Batton, Baltimore County Police.

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WJZ has since learned that Long tried to kill himself and is in a coma.

Police have not released exactly how the couple was killed, only saying they suffered traumatic injuries and were not shot to death. A murder weapon was found at the scene.

From the start some neighbors wondered why Long wasn’t around.

“If my grandparents were found dead I’d be here in a hot flash. I want to know what’s going on, what happened,” Davis said.

One neighbor put up a memorial in front of the Pepper family’s home, telling WJZ he wanted people to know they were missed and the community was disgusted by what happened.

Baltimore County police are currently in Oklahoma. Long has not been officially charged. A possible motive has not been released.

Vaughn Pepper was a retired Maryland State Trooper. He and his wife had lived in their home for 20 years.

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