Rachael DelTondo, 32, died on Mother's Day six months after being suspended from her job.
DelTondodied at the scene, 35 kilometres northwest of Pittsburgh.
The death has stunned neighbors in the quiet neighborhood and police are hunting for clues to the identity of the killer.
Her employer, the Pennsylvania Cyber Charter School, and the Lincoln Park Performing Arts Charter School then suspended her.
The suspension came after school officials received an anonymous email containing a February 2016 police report stating DelTondo had been found in a parked auto with a 17-year-old former student.
The report said that at roughly 1:50am on 6 February, 2016, they investigated a auto parked near an old hospital in the town of Aliquippa.
"The windows were steamed over and the engine was not running", police noted in their report.
Inside was DelTondo and the teen.
One of her neighbours reported that he had heard the incident take place. Hayden said the student did not attend the online public school.
Flirty texts and Snapchat messages later showed that the pair had a "relationship". The email pointed to the police report and said that DelTondo was in a "relationship" with the boy.
She also said 'she didn't want her fiancé to know that she was here parked because he would get mad'. Officers later drove the teen home. The report was not public knowledge until the anonymous email was sent in October a year ago. She was an elementary school teacher but was suspended months before her death.
The leak prompted a state police investigation of the Aliquippa Police - which DelTondo complied with.
These are the early conclusions of investigators in Aliquippa, Beaver County, Pa., where several layers of law enforcement are probing Sunday night's shooting death of suspended cyber teacher RachaelDelTondo, age 33.
Former boss Hayden said in a statement: "We were saddened this morning to learn of the tragic death of RachaelDelTondo, apparently the result of a violent incident in the city of Aliquippa".
Local police later launched an investigation into the information leak, with which DelTondo reportedly cooperated. We express our sympathy to her family, friends, and coworkers.
"Nobody, including Ms. Deltondo, the Aliquippa Police Department, the juvenile male or his family, or any other person or agency had informed PA Cyber of this or any other incident".
DelTondo and her family also made headlines in February 2017 after a dustup with the bridal shop assisting in her wedding planning.
The teacher was planning a big, elaborate wedding with her Italian-American family, which included a $10,000, custom-made dress from a NY designer, CBS Local reported.
When the designer did not appear in court, a judge ruled that he should pay the DelTondos over $4,600.
However, a year later, a report of the incident was leaked to the press. I don't know why that happened. "Beautiful lady, friendly. Knew everybody, talked to everybody".