Oregon ? A woman accused of killing her pregnant friend is believed to have cut open the 21-year-old’s abdomen to take her baby and pass it off as her own, investigators said Monday.

The infant also died, but it could not be determined whether he was alive when he was taken from Heather Snively’s womb, the Washington County sheriff’s department said in a statement.

A 27-year-old woman, Korena Roberts, has been charged with murder in Snively’s death. She appeared in court Monday but did not enter a plea.

A 911 call on Friday brought emergency workers to Roberts’ house in the Portland suburb of Beaverton. Workers found blood on the floor and Roberts’ boyfriend trying to revive the infant.

Investigators said Roberts claimed the baby was hers. At the emergency room, doctors, who were unable to revive the baby, determined that Roberts had not given birth.