Tokyo police found the killer's DNA and fingerprints in the Miyazawas' house, but none matched the databases of the Tokyo police, indicating that they do not have a criminal record. The killer's blood was gained during an analysis of the murder scene that revealed traces of Type A blood, which would not have belonged to the Miyazawa family. A DNA analysis of the Type A blood determined the killer is male and possibly mixed-race, with maternal DNA indicating a mother of European descent, possibly from a South European country near the Mediterranean or Adriatic Sea, and paternal DNA indicating a father of East Asian descent.[15]