On Thursday Curry-Demus allegedly told police she had paid $1,000 for the baby after authorities say tests proved she wasn't the child's mother.
Allegheny County Medical Examiner Dr. Karl Williams said the woman had been dead about 24 hours, but Williams said he could not tell if she had recently given birth. The autopsy was scheduled for Saturday.
Some blood was found near the body, Williams said, but he would not say if there were signs of trauma.
Investigators said police checked on Curry-Demus' apartment after reporters called authorities about a foul odor coming from inside. Wilkinsburg Police Chief Ophelia Coleman said the body was found lying face down.
Police had been at the building Thursday night, but did not go into that apartment, Coleman said. Instead, a relative of Curry-Demus led them to another apartment, she said.
Earlier Friday, police said they were concerned that the infant's real mother
- described as a thin, black female in her 20s or 30s named Tina - might be in danger, or need medical attention.
The description was provided by Curry-Demus but authorities aren't sure how reliable it is because she "has a history of emotional problems," Coleman said. The body found Friday was that of a black woman, but Williams said he couldn't tell how old she was.
The families of two missing pregnant women, both of them black, waited at the crime scene Friday night for police to identify the body.
County detectives, who are now handling the investigation, entered Curry-Demus' apartment Friday night after obtaining a search warrant.
In 1990, Curry-Demus, then known as Andrea Curry, was accused of stabbing a Wilkinsburg woman in an alleged plot to steal the woman's infant.
A day after the stabbing, Curry-Demus snatched a 3-week-old baby girl from Children's Hospital of Pittsburgh, according to court records reviewed by the Pittsburgh Tribune-Review. The baby was in the hospital to be treated for meningitis and the girl's 16-year-old mother had gone home for the night when Curry-Demus took the child, court records state. The baby was found unharmed with Curry-Demus at her home the next day.
Curry-Demus pleaded guilty in 1991 to various charges stemming from both incidents and was sentenced to 3 to 10 years in prison. She was paroled in August 1998 and began serving a 10-year probation term, the Tribune-Review reported.