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The former parole officer of a high-profile serial rapist -- soon to be released into a small California community -- said he believes the violent sexual predator will repeat his offenses and fears him "more than a Mexican Mafia killer."

In an e-mail sent to the Los Angeles County District Attorney, retired parole officer John Bays writes that Christopher Hubbart, who admitted to raping at least 40 women in the 1970s and 80s "scared me more than any Gangbanging Killer I ever met."

The e-mail, dated Nov. 5, 2013, was obtained by FoxNews.com following the announcement that Hubbart will be released into a residential community in Lake Los Angeles by July 7.

"I know more about Christopher Hubbart than I care to remember," wrote Bays, who served as Hubbart's parole officer in the 1990s. "Why does Chris scare me more than a Mexican Mafia Killer? Because Hubbart's actions are 'compulsive' ... personal compulsions at the expense of another's life."

"I fought hard to keep Hubbart locked up for obvious reasons," Bays said. "Christopher Hubbart is where he belongs - that I am proud of."

Hubbart, 63, who confessed to raping at least 40 women in Los Angeles and San Francisco between 1971 and 1982, will be released from a state psychiatric facility and placed in a home in Lake Los Angeles within the next few days, local enforcement confirmed to FoxNews.com.

Hubbart will reside in a small, one-story white house in a neighborhood off Avenue R and 203rd Street in Lake Los Angeles, a rural, desert community in the northeast corner of Los Angeles County where Hollywood movies and commercials were once made.

While sheriff's deputies have pledged to do all they can to ensure safety, residents are daunted by the imminent release of Hubbart, who earned his grim moniker for the method of his crimes: binding victims' hands before pulling pillowcases over their heads to silence their screams.

Multiple sources identified Hubbart's landlord as Martyn Haggett, a convicted felon who served eight years in prison for hiring a hitman to kill his then-estranged wife and her boyfriend.

Records obtained by FoxNews.com show Haggett purchased the property where Hubbart will reside on January 2.Haggett could not be reached for comment.

Liberty Health Care, the company responsible for monitoring Hubbart for several weeks after his release, is renting the home from Haggett. Palmdale Mayor James Ledford previously told The Associated Press the state would pay about $2,400 per month for a home that would normally rent for just $500.

Hubbart has been confined to a mental health facility since 1996. Los Angeles County District Attorney Jackie Lacey petitioned the state Supreme Court in July 2013 to block Hubbart’s release, but the court denied her request, prompting widespread protests in the community.

Hubbart will not be on probation or parole, law enforcement says, but he will wear a GPS ankle bracelet and register as a sex offender with the Lancaster Sheriff's Station, one of 23 subdivisions of the Los Angeles County Sheriff's Department directly tasked with security matters surrounding Hubbart.

Area residents told FoxNews.com that maintenance workers could be seen this week preparing the house for Hubbart's imminent release, causing panic among many Lake Los Angeles women.

Cheryl Holbrook, a member of the group, "Ladies of Lake L.A.: Women on a Mission," said she and others have been fighting Hubbart's release for months.

"When I found out he was going to be released here, I broke down crying and had the shakes," said Holbrook, who told FoxNews.com she was raped by two men as a 14-year-old.

"I told the judge that the blood will be on his hands," Holbrook said.

Last week, Sharon Duvernay, who lives next door to the home Hubbart plans to move into, told FoxNews.com she was raped nearly 60 years ago by a neighbor when she was just a toddler. Duvernay said she is so terrified of having a serial rapist nearby that she plans to get a guard dog.

Deb Hill, another member of the group, said the rate of recidivism is high for violent sexual predators, whose crimes often escalate.

"When you've done this all your life, you're going to repeat it," Hill said. "I believe that this time he won't leave the victim around to tell the story."

Hill described Haggett as "a man with no conscience."

"He doesn't care. He's doing this for the money," she said. "The rent is a huge profit for him. This [house] is a one-room little shack."