In the Fall of September 1979 Southern California had three active serial killers and an additional two that had been apprehended that year. This is why, when a fourth is announced to the public, panic swept Orange County. They called him the Bedroom Basher. He prayed on young women who were alone in their first floor apartment buildings. He would use a blunt weapon to render them unconscious and then sexually assault them. On September 30th, he walked through the front door of Dianna D’Aiello’s apartment, little did he know it would be this case, that would be his undoing. 
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Sources:https://casetext.com/brief/s076169-people-v-parker-gerald-respondents-briefhttps://www.latimes.com/archives/la-xpm-1996-08-20-mn-35921-story.htmlhttps://www.latimes.com/archives/la-xpm-1999-jan-22-me-566-story.htmlSource 3Source 4