Muller was in prison for the infamous Vallejo kidnapping when he implicated himself in unsolved attacks in Palo Alto and Mountain View, prompting a renewed investigation and DNA analysis.

Matthew Muller, who is currently serving a 40-year sentence for the kidnapping of Denise Huskins, pled guilty Friday in Santa Clara County court on new charges of medicating and then sexually assaulting another woman.

Matthew Muller pleads guilty to home invasion sexual assaults from 2009, with a life sentence for each count, concluding a crime spree including the 2015 Vallejo kidnapping.

Matthew Muller, who is currently serving a 40-year sentence for the kidnapping of Denise Huskins, pled guilty Friday in Santa Clara County court to new charges stemming from a pair of home invasion sexual assaults.

Matthew Muller was convicted of kidnapping and sexual assault in a 2015 case in which Vallejo police initially accused the victim and her boyfriend of making up the story of her abduction. He pleaded guilty this week in two additional cases.

Matthew Muller pleads guilty to invading woman's homes in Mountain View and Palo Alto in 2009, six years before kidnapping Denise Huskins in Vallejo in ordeal initially deemed a hoax.

Muller admitted he committed two home invasions in 2009--one in Palo Alto and one in Mountain View. During those home invasions, Muller held captive, interrogated and threatened to rape two women.