Accused Hollywood Ripper Michael Thomas Gargiulo 'studied forensics, researched serial killers like Ted Bundy and read a book about how to kill people', a court has heard.
Gargiulo, 43, has pleaded not guilty to the murder of two women, including TV star Ashton Kutcher's ex girlfriend Ashley Ellerin, 22, and a mother-of-four Maria Bruno, 32.
The jury at his murder trial heard on Tuesday how Gargiulo thought he was 'smarter than the police'.
Assistant District Attorney Garrett Dameron said in his closing arguments that Gargiulo 'took pleasure in plunging a knife into his victims over an over again, leaving them to to die and be found by their loved ones', according to the Daily Mail.
Gargiulo, dressed in a white shirt and dark pants with shaved head, appeared calm in front of the packed courtroom.
Mr Dameron told the jury: "He [Gargiulo] took precautions not to leave evidence behind.
"He never left behind any weapon of article of clothing and he disposed of that evidence.
"He researched other serial killers, like Bundy. He told people he knew how to leave no fingerprints.
"He knew how to avoid being seen exiting a crime scene covers in blood and with a bloody knife."
Gargiulo, who also dubbed as Hollywood Ripper for allegedly killing up to 10 women, had a book called 'The Anarchist Cookbook' which explains how to kill people.
"The Anarchist Cookbook tells how to hold a knife, how to kill with one...how to cause death in a matter of seconds," said Mr Dameron.
Police were said to have found that Gargiulo had logged onto a website called The Evidence Eliminator, which told him 'how to conceal and cover tracks', from a computer they confiscated.
Ashley Ellerin had been stabbed 47 times, with wounds of up to six inches deep over her chest, stomach, neck and back.
Prosecutor Daniel Akemon told the court Gargiulo, 43, had "injected himself" into Ashley's life by changing her tire and fixing her furnace.
"He gatecrashed a party at her home and fixated on her. Somehow he got a copy of a key to her apartment and let himself in…then ran away," Daniel said.
He was also charged with the murders of Maria Bruno, who was stabbed to death at age 32 at her home in the Los Angeles suburb of El Monte in 2005, and the attempted murder of Michelle Murphy, the only surviving victim who led to Gargiulo's arrest.
