From 1974 to 1986, a mysterious man carried out more than 100 burglaries, more than 50 rape cases and killed at least 13 people in California.

Residents of Visalia, California lived in fear from April 1974 to December 1975, when a thief broke into at least 100 houses to rummage homeowner's personal belongings.

But the home breakups gradually failed to satisfy him.

After choosing a target, he often sneaked into their home first, following the victims' activities to memorize habits.

At first the rapist attacked single women or single mothers, but then shifted the focus to the couple.

Sometimes he set up dishes on the man's back and threatened to kill two people if he dropped them in the process of raping the woman.

Sometimes neighbors or police caught the name "love blue beard" but he escaped by climbing over the fence or cycling.

On the night of 2/2/1978, young couple Mather and Katie Maggiore in Sacramento were walking their dogs in Rancho Cordova area, where 5 rapes happened, when they were shot.

Since 1979, he has relocated his operations from northern California to southern California but has not stopped at rape.

With evidence at the scene and description of the victim, the police identified the suspect as a white man 1m75 or 1m78 tall, with a muscular physique.

However, the police have pursued many false clues, leading them to a dead end.

The killer has repeatedly teased the police.

From 1977 to 2001, he made several phone calls to investigators to ridicule.

This year, thanks to technological advances, DNA evidence helps police link cases in various parts of California.

In early 2013, crime writer Michelle McNamara gave him the nickname "Golden State Murder".

In 2016, the FBI released a series of data on "Golden State Murderer," including sketches and details of his crimes, offering a reward of $ 50,000 to informants.

"If he were still alive, the killer would now be 60-75 years old, described as a white man, almost 1m8 tall, blond or brown, muscular. He might be interested or

On April 24, 2018, Joseph James DeAngelo, born in 1945, was arrested in California.

The DeAngelo identification process began around the end of 2017, when officials uploaded the killer DNA file to the GEDmatch database.

On April 18, 2018, officials secretly collected DNA samples from DeAngelo's door handle and then collected tissue paper from his trash.

After being arrested, DeAngelo said that an inner personality named "Jerry" stopped him from doing evil.

However, officials suspect DeAngelo pretends to have multiple personality disorders.

DeAngelo cannot be prosecuted for rape or theft, because the statute of limitations has expired for those offenses, but he is charged with 13 counts of murder and 13 counts of kidnapping in connection with rape cases.

In April 2019, prosecutors said they would propose a death sentence for DeAngelo.

James Alan Fox, a criminologist at Northeastern University, said most serial killers do not have a different personality or inner voice motivating them to commit crime, although the films are often depicted in

He commented that serial killers who have eluded justice for years are often crafty and meticulous while those with serious mental illnesses cannot afford it.

"They only try to deny it when they say they caused all the sins committed by a voice in their heads. 'Don't blame me, blame that voice', the killers wanted to say.