John Bradley is accused of fatally stabbing his ex-girlfriend, 16-year-old Rianna Glass, and her 39-year-old mother Rosalyn Glass last Thursday.
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Investigators say Bradley then stole the mother's car and crashed it. The wreck was found around 6 a.m. Thursday.
The crash seriously injured an unidentified 14-year-old girl who was seen near the home around the time of the murders.
Bradley and the 14-year-old girl were ejected from the speeding car and a knife was found near Bradley, authorities say.
He was taken into custody in his home in North Whitehall Township and is being held without bail.
The teen girl is being treated at CHOP.
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The double homicide happened last week at the victims' home on the 1100 block of Railroad Street.
Rosalyn Glass was found at the top of the stairs with stab wounds and pronounced dead. Rianna, a junior at Northampton Area High School, was found dead on the floor of a bedroom, also with stab wounds.
"The defendant and the victim were at one time boyfriend and girlfriend and had broken up in August 2023. He had recently been informed by the victim that she had begun a relationship with another person," said Northampton County District Attorney Terence Houck.
State police investigating after woman, teen girl found dead inside Northampton County home
Houck intends to try Bradley as an adult. Investigators recovered DNA and have looked at surveillance cameras.
Last Wednesday night, Rianna told a family friend that Bradley was coming over. Then, in the early hours of Thursday morning, that same friend received a text that Bradley would not leave.
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Rianna and her mother were found dead on Thursday.
Those who knew the mother and daughter have gathered to remember them in the days that have passed.
"I brought some flowers and say a little prayer," said family friend Golde Mari.
"I can still feel her aura, she's still alive. I don't want to think that she's gone completely," said another friend Julie Klein.
A memorial service for the victims is scheduled for Saturday. A GoFundMe has been established to help raise funds for the service.