SAN JOSE, Calif. (KRON) -- Matthew Muller, the notorious rapist who was convicted of kidnapping Denise Huskins in Vallejo, recently confessed to carrying out more crimes against women around the Bay Area before the Huskins incident, court documents obtained by KRON4 on Tuesday revealed. In a series of prison letters written in 2024, Muller not only confessed to targeting more victims, he also explained why he did it, according to a Palo Alto Police Department report filed in Santa Clara County court. Muller, 47, was featured in a Netflix documentary, "American Nightmare," that chronicled Huskins' harrowing experience when Muller kidnapped her from her Vallejo home and held her for two days inside his South Lake Tahoe cabin in 2015. After Muller dropped Huskins off in Southern California and the missing woman was found, Vallejo police falsely accused her of faking her own kidnapping in a "Gone Girl"-inspired hoax. Denise Huskins attends the 2024 Critics Choice Real TV Awards on June 15, 2024 in Los Angeles. (Photo by Steve Granitz/FilmMagic) Earlier this year, Huskins began working with Seaside Police Chief Nick Borges on how to improve training for law enforcement officers handling sex assault cases. Borges said he had never heard of the unsolved 2009 South Bay cold cases until he watched "American Nightmare." The cases were included in the documentary because of striking similarities to the Huskins case. After his conversations with Huskins in March, Chief Borges began sending letters to Muller, who was an inmate at a federal prison in Arizona. On April 15 and May 6, 2024, Chief Borges received reply letters from Muller in which he confessed to victimizing Huskins in Vallejo, as well as a woman in Palo Alto, and a third woman in Mountain View, a 73-page long police report states. The letters were detailed in new court documents filed as part of a new criminal case against Muller in Santa Clara County. On Monday, the district attorney announced that new DNA evidence connected Muller to a 2009 home invasion and attempted rape in Mountain View, and a second 2009 home invasion in Palo Alto. In both incidents, the victims were young women who were tied up and drugged by a man who broke into their bedrooms. Timeline: Matthew Muller and ‘Gone Girl’ Vallejo kidnapping case In one prison letter, Muller explained why he first began breaking into the homes of young women with intentions to rape them, court documents state. Muller said his criminal life began with voyeurism. Over time, it escalated into home invasions, attempted rapes, and ultimately kidnapping a rape victim. Matthew Muller is seen in mugshots from 2015 and 2018. (Images via Solano County District Attorney's Office) "Muller discussed the Mountain View crime. The idea to raid a home and rape a woman developed in August or September 2009 and he was in a manic state. His decision making was impaired and warped. He began taking late night walks and began watching people in their homes. (Muller) saw a woman undressing in a home and (this) was his first experience with voyeurism," court documents state. "In reference to the Mountain View crime, Muller entered through the kitchen. He went upstairs, woke the victim, made her drink a combination of Nyquil and anxiolytic. He also bound the victim. Muller intended to rape the woman, but he did not want to. Muller described the victim as white, attractive, dark-haired, about 30," the police report writes. "Muller continued late night walks and looking into houses. Muller took interest in Palo Alto's College Terrace neighborhood," near Stanford University, the report states. When a Palo Alto Police Department officer noticed Muller during one of his late night walks on Williams Street, Muller lied by claiming he was a Harvard University professor who was a visiting faculty member at Stanford. Muller had taught at Harvard, but he never had a job at Stanford, investigators said. On Oct. 18, 2009, "Muller broke into a Palo Alto home, bound and gagged a woman in her 30’s and made her drink Nyquil. He then began to assault her, before being persuaded to stop. Muller gave the victim crime prevention advice, then fled," prosecutors wrote. In his letters to Seaside Police Chief Borges, Muller admitted to carrying out the Palo Alto crime. In one handwritten letter from Muller dated May 23, 2024, Muller explained why he is now willing to cooperate with investigators to solve the 2009 South Bay cold cases. His change of heart was not caused by "remorse, his mental health, or his born again Christian religious conversion," court records state. Instead, Muller claims he feels a "common goal" with police for protecting victims and "strengthening laws for future potential victims," court records state. Denise Huskins retells her 'American Nightmare' at Seaside training event for cops Muller wrote another letter to the police chief on June 19, 2024, in which he describes how he's trying to "redeem" a "terrible situation" while he is locked in prison. Before the Huskins case made national headlines and was turned into the "American Nightmare" documentary, Muller served as a Marine, graduated from Harvard University, and worked as an attorney in California. In his June 2024 letter, Muller described "how it's strange that he used to protect and enable women, and was somehow driven to hurt them instead." Denise Huskins walks into a news conference in San Francisco on Sept. 29, 2016. (Photo By Paul Chinn/ The San Francisco Chronicle via Getty Images) Muller was locked up in federal prison for seven years after he was convicted in 2017 of kidnapping Huskins. During his 2017 sentencing, U.S. Attorney Phillip Talbert said, "Muller had advantages in life that most people only dream of, yet he used his considerable intelligence to plan and execute the physical assault and psychological torture." Seaside Police Chief Borges said he consulted with Huskins before he sent any letters to Muller. In July of 2024, Borges handed the notorious kidnapper's alleged confession letters over to the police chiefs of Palo Alto and Mountain View. Borges explained to the chiefs that he became interested in their cold cases because of the Netflix documentary. Borges told the Palo Alto and Mountain View chiefs that Muller "wants to confess all his past crimes." Borges decided to not reach out to the Vallejo Police Department, which, according to Huskins, never fully apologized for calling her kidnapping a hoax. Last week, Muller was transported from a federal prison to a county jail in San Jose to face new charges for the 2009 South Bay cold cases. Santa Clara County District Attorney Jeff Rosen said advances in DNA technology allowed investigators to make a DNA match from evidence found at the Palo Alto crime scene. Muller's DNA was detected on one of the bindings that was used to tie the victim up, Rosen said. The prison letters were included with new DNA evidence to prosecute Muller in Santa Clara County, court records show. On Monday afternoon, Muller briefly appeared in court and did not enter a plea. He is scheduled to be arraigned at the Hall of Justice on January 17. A judge ordered the high-profile inmate to remain locked in a San Jose jail cell with no bail. Rosen told reporters outside the courthouse, "I think it’s fair to say that there were mistakes made in this investigation. What we’re proud to say now is that we’re able to bring this perpetrator to justice." Rosen added, "The details of this person’s violent crime spree seem scripted for Hollywood, but they are tragically real. Our goal is to make sure this defendant is held accountable and will never hurt or terrorize anyone ever again. Our hope is that this nightmare is over."