The 26-year-old was accused and wanted by police officials for the murder of Tyler Roy, 28, and Christina Roy, 27, who were found dead in their apartment on Tuesday in Churchville, Northampton Township, Bucks County.
"Our team is unequivocally convinced that he killed the victims and he acted alone".
At a news conference on May 2 in Northampton, First Assistant District Attorney Gregg D. Shore disclosed the death of suspect Daniel Kenneth Mooney from an apparent drug overdose.
"We believe he could be armed", Shore said, "and he certainly may be unsafe, based on the goings-on over the past couple of days".
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The president praised pilot Tammie Jo Schults, shaking her hand and recognizing her son who was also among the guests. Once on the ground, Shults, a Texan and former Navy fighter pilot, walked up and down the aisle hugging passengers.
On Wednesday morning, the Roys' Ford Edge SUV was found in Northeast Philadelphia, along with Mooney's cell phone.
Anyone who encounters Mooney is asked to call 911.
Shore said that Mooney may be "walking with a pronounced limp, and could also be armed and unsafe".
A vehicle was missing from the home, said a spokesman for the Bucks County District Attorney's Office.
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"They seemed to be a nice young couple that just happened to be unfortunate victims in this case", said Clark. Autopsies will be conducted Thursday morning to establish the exact causes of death.
Both victims had been stabbed repeatedly and shot, Shore said, most likely by a long gun found in the home that belonged to Tyler Roy. It's unclear if the Roy's were friends with Mooney, though at this point authorities believe there was no relationship.
The slayings came to light Tuesday morning, May 1 when a house painter who was working on the outside of the home came inside and found one of the bodies around 10 a.m.
"Clearly vibrant lives have been lost as a result of this tragedy". Officers arriving on scene found the wife's body on the same floor, police said. Mooney previously lived in the same neighborhood as the victims, but had no other apparent connection to them, he said.
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Police impounded his vehicle and he was handed over to the Foreign Office after verification of his documents. This comes weeks after American military attaché Colonel Joseph E Hall killed a motorcyclist in a collision .