A suspect in the murder of a woman and her teenage daughter in North Catasauqua was arrested Tuesday at his home in North Whitehall Township.

Northampton County District Attorney Terry Houck said in a press conference that John Derwin Bradley, 17, of Schnecksville, was charged with two counts of criminal homicide related to the death of Rosalyn Siobal Glass, 39, and her 16-year-old daughter, Rianna Lynn Glass, on Sept. 14.

An obituary at Reichel Funeral Home in Northampton says Rianna Lynn Glass was a junior at Northampton Area High School.

Bradley was arraigned before Magisterial District Judge Robert Hawke, and is being held without bail. In addition to the two counts of criminal homicide, he has also been charged with one count of theft of motor vehicle.

Houck said Bradley allegedly took a Nissan Murano, owned by Rosalyn Glass, the morning of the murders, and crashed it in the area of Spring Valley Road in Upper Saucon Township.

Both Bradley and his passenger, a 14-year-old girl from Orefield identified only as S.K.Q., were thrown from the vehicle. Bradley was transported to St. Luke’s Hospital Bethlehem Campus, and the girl was transported to Children’s Hospital in Philadelphia. She remains in the hospital in serious condition, Houck said.

Houke said officers from Upper Saucon Police Department responded to a single motor vehicle crash in the area of Spring Valley Road at about 5:53 a.m. on Sept. 14. When they arrived, they found two teens, later identified as Bradley and S.K.Q., ejected from a silver Nissan Murano. They determined the vehicle belonged to Rosalyn Glass.

Officers found a Smith and Wesson HRT fixed-blade, double-edged knife with a red-brown stain and a white long-sleeved T-shirt with a red-brown stain near where Bradley was sitting, Houke said.

At 7:35 a.m., a request came in to the North Catasauqua Police Department to contact the residents at the Railroad Street address. The officers tried to contact Rosalyn Glass, but there was no response at her door, Houke said.

At 11:33 a.m., the officers were again dispatched to the residence on reports of an unresponsive woman discovered by an adult family friend inside the residence. The officers found Rosalyn Glass deceased at the top of the staircase, Houke said. Her daughter, Rianna, was also found deceased in an upstairs bedroom.

As part of the investigation of the murders, Houke said the Pennsylvania State Police viewed video door footage from Glass’s neighbors. One video showed a male that looked like Bradley walking in front of the victims’ residence in the 1100 block of Railroad Street at about 9:11 p.m. on Sept. 13. Another camera captured the male walking toward the rear of the Railroad Street residence.

At about 2:33 a.m., a female who looked like S.K.Q. was seen in video footage walking in front of the residence, Houke said. Another camera caught her entering the front of the house a minute later.

Around 3:32 a.m., cameras captured the same male and female walking away from the rear of the Railroad Street address toward Arch Street, where Rosalyn Glass was known to park her silver Nissan Murano. An SUV meeting the description of Glass’s vehicle was seen on video about seven minutes later traveling west on Arch Street going west going away from the Railroad Street address.

Houke said a search warrant was executed on Sept. 15, and swabs to collect DNA for forensic analysis were taken from Bradley at St. Luke’s Hospital Bethlehem Campus.

On Sept. 16, autopsies performed at the Northampton County Forensics Center revealed that Rosalyn Glass died from multiple stab wounds. Rianna Glass died from neck compression and stab wounds.

“The stab wounds on both victims were consistent with that of a double-edged weapon,” Houke said.

Forensic analysis further revealed that the handle of the Smith and Wesson HRT fixed-blade, double-edged knife found at the crash scene contained the DNA of three people - Bradley and both victims.

Houke said two samples of a red and brown stain taken from the first-floor kitchen of the victims’ house contained Bradley’s DNA profile.

“As a result of that, a warrant was secured for the arrest of the defendant, and he was taken into custody without incident,” Houke said.

After being processed, Bradley was transported to the Northampton County Juvenile Justice Center.

“I can’t emphasize enough how quickly and professionally this job was done by the Pennsylvania State Police and Chief Deputy District Attorney Bill Blake,” Houke said. He also praised Chief Christopher Wolfer, of the North Catasauqua Police Department, for contacting the Pennsylvania State Police quickly.

The homicides and the crash are still under investigation. Houke could not give any information as to why Bradley and S.K.Q were traveling in Upper Saucon Valley, if the crash was deliberate, or the relationship between Bradley and S.K.Q.

“She hasn’t been able to speak with police at this point,” Houke said.

Houke did say that Bradley and Rianna Glass had been in a relationship that broke up in August. She had begun seeing someone else, and told Bradley. Houke said the police are investigating reports that Bradley of domestic violence between Bradley and Rianna Glass.

“We are still looking at all the surrounding circumstances,” Houke said.