The Summit County Medical Examiner's Office, which conducted the autopsies, identified the victims as Ronald Roberts, 24; Kem Delaney, 23; Maria Nash, 19, and Kiana Welch, 19, WEWS-TV, Cleveland, reported.
Roberts was living in the home and was dating Welch, family members said.
"My thoughts are that my son wouldn't have hurt anyone," Roberts' mother said. "He would have given you the shirt off his back, and whoever did this needs to be found and held responsible."
No arrests were reported.