( CNN ) -- A woman whose body was found in the crawl space of an Oregon home -- the mother of a newborn who also died -- died from `` homicidal violence , '' the state 's deputy medical examiner said Monday . Police released a photo of Korena Roberts , who is charged with murder . An autopsy showed causes of 21-year-old Heather Snively 's death included blunt-force trauma and `` sharp-force injuries , '' Dr. Christopher Young said . Sharp-force injuries mean cut or stab wounds . Young said additional information will not be released until test results are received . Korena Roberts , 28 , is charged with murder in Snively 's death . She was scheduled to appear in court Monday afternoon . Medics received a call Friday from Roberts ' Washington County , Oregon , home of a newborn in distress , authorities said . When they arrived , they found Roberts ' boyfriend trying to revive the baby boy . Roberts told deputies the baby was hers , according to the county sheriff 's office . Roberts and the baby were taken to a hospital after medics noticed a lot of blood at the home , officials said . `` Doctors at the hospital could not revive the baby , '' said sheriff 's Sgt . David Thompson . `` They also discovered that Ms. Roberts had not delivered the baby at any time in the recent past . '' Deputies returned to the home and found Snively 's body in a crawl space beneath the kitchen . Police said she had been pregnant ; authorities determined she was the baby 's mother . `` At this time , it has not been determined if [ Snively ] died because of head wounds she received or as a result of cutting injuries she received to her abdomen , '' said a Monday statement from the Washington County , Oregon , Sheriff 's Office . `` The autopsy determined that Ms. Snively 's son was removed from her womb after she had been cut open . '' Additional testing is needed to determine whether the infant died before or after he was removed from Snively 's body , the statement said . Roberts had been telling friends and family for months that she was pregnant , police said , and had told many of those people , including her live-in boyfriend , that she was carrying twins . Young said an autopsy was completed on the baby , but he would not release information Monday . Authorities said Sunday the outcome of the autopsy could result in another murder charge against Roberts . Heidi Kidd , Snively 's mother , told CNN affiliate KPTV that her daughter met Roberts on Craigslist , a classified ads Web site , and the two were to exchange baby clothes . Residents in Roberts ' neighborhood told KPTV that she had told them she was expecting a child . `` She did n't appear to be pregnant to us , '' neighbor Doug King told the station . Police think Roberts may have had contact with numerous pregnant women in the Portland , Oregon , metropolitan area , the statement said , and police ask anyone who has had contact with her , either in person or over the Internet , to call the Washington County Sheriff 's Office . Roberts ' boyfriend is cooperating with police , and has not been charged in the case , authorities said . Washington County is about 30 miles west of Portland , Oregon . CNN 's Chuck Johnston and Janet DiGiacomo contributed to this report .
NEW : Heather Snively 's baby was cut from her stomach , authorities say . The baby's mother is charged with murder and child endangerment in the death of her newborn son. Cops find Snively 's body in Roberts ' crawl space . Police called to Roberts ' house for report of baby in distress ; baby could n't be saved .