She had been beaten to death.
Darby was charged in March with rape, sexual assault and other charges in another county.
"We do not believe at this time that this was a random act of violence", said Pittsburgh Police Chief Scott Schubert.
Authorities said she died of head trauma, and the case was ruled a homicide. The Violent Crime Unit is continuing the investigation.
"Upon entry, officers found the 20-year-old female on the second floor of the living arrangement", police said in a news discharge. Paramedics pronounced her dead at the scene, according to a release.
Darby was arrested September 26 and charged with felony criminal trespass for allegedly breaking into Sheykhet's apartment.
In her request for a protection order, Ms Sheykhet said Mr Darby "climbed up the gutter on the side of the house and broke through the second-floor window of my home", the Pittsburgh Post-Gazette reported. "They were crying so noisy I thought perhaps it was her beau, yet after I understood ..."
Because of his absence, the DA is in the process of getting a judge to revoke Darby's bond, making him wanted by law enforcement in two counties.
'She wasn't answering my call.
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Darby was also a student at the university until last month when he dropped out.
She was found dead on the floor of her room.
The Sheykhet family declined to comment when The Pitt News contacted them Monday evening.
In the PFA subsequently filed against Darby, Sheykhet said repeatedly grabbed, pushed and subjected her to abuse, as well as being controlling and jealous, according to the report.
Cops said they were called to the Cable Place home in the city's Oakland segment at around 9 a.m. "She was the best person in the world".
A 20-year-old understudy at the University of Pittsburgh was executed in her loft throughout the end of the week - her dad finding the young lady's body subsequent to separating her entryway, specialists and family said. He said those who knew her will miss her enthusiasm and ability to lighten everyone's mood.
Schlaegle had performed close by Sheykhet in musicals and move presentations outside of school, he said.