Speed Freak Killers

Herzog and Shermantine grew up as childhood friends in the town of Linden, California. The citizens of Linden, a small town with fewer than 2,000 people, 95 miles east of San Francisco, were long aware of the duo's reputation as methamphetamine users. They were regulars at the Linden Inn, a bar owned by the father of 25-year-old Cyndi Vanderheiden of Clements, California. Vanderheiden went missing after leaving the Linden Inn with Herzog and Shermantine on November 14, 1998.

Investigation into Vanderheiden's disappearance was ongoing into 1999, and Shermantine was the prime suspect. In mid-January 1999, Shermantine's car was repossessed, and was subsequently searched by the San Joaquin Sheriff's Department. Blood identified as being from Cyndi Vanderheiden was discovered in the car, and while DNA test results were being confirmed, the sheriff's department focused on Loren Herzog, Shermantine's friend and suspected accomplice. He was extensively questioned.

Herzog described when Shermantine shot a hunter they ran into while they were on vacation in Utah in 1994. Utah police confirmed that a hunter was shot to death, but his murder was still classified as unsolved. Herzog also said Shermantine was responsible for killing Henry Howell, who was found parked off the road on Highway 88 in Alpine County with his teeth and head bashed in. Herzog said he and Shermantine passed Howell parked on the highway and Shermantine stopped, grabbed Howell's shotgun, killed him, and stole what little money he had. Additionally, Herzog gave specific details about how Shermantine killed Robin Armtrout.

Herzog and Shermantine both were arrested by the San Joaquin County Sheriff's Department and charged with several counts of murder each in March 1999.

In 2001, a jury found Shermantine guilty of four murders: those of Vanderheiden, Howard King and Paul Cavanaugh – each shot dead in his car in 1984, and 16-year-old Chevelle "Chevy" Wheeler, who disappeared in 1985 from Franklin High School in Stockton after telling friends she was leaving school to go with Shermantine to his family's cabin in San Andreas.[7] Shermantine was sentenced to death and is on death row at San Quentin State Prison.

Herzog was charged with five counts of murder in 1999: that of Cyndi Vanderheiden, Henry Howell, Paul Raymond Cavanaugh, Howard Michael King III, and Roberta "Robin" Ray Armtrout.[8] In his 2001 trial, a jury found him guilty on three murder counts (Vanderheiden, Cavanaugh, and King), the lesser charge of accessory to murder in the Howell count, and acquitted him on the Armtrout count.[9] Herzog was given a 78-year sentence.

An appeals court overturned all of Herzog's convictions in August 2004, after ruling that three of Herzog's four confessions were coerced.[10] In the case of the fourth, that of Cyndi Vanderheiden, a retrial was ordered. This retrial never took place. Rather, a plea bargain was reached, where Herzog pleaded guilty to voluntary manslaughter and furnishing amphetamine in the Vanderheiden case, and to being an accessory to murder in the Cavanaugh, King, and Howell cases. Accordingly, Herzog's sentence was reduced to 14 years, with credit for six years served.[10] With credit off his sentence for good behavior, Herzog served 11 years in prison and was in a position where he was to be paroled by 2010.

Opposition to the inevitability of Herzog's parole was extremely vocal, especially from victims' families.[11] That no California county wanted to take him for parole led the California Department of Corrections to parole him to a trailer stationed outside the front gate of the High Desert State Prison in Susanville, California in Lassen County in September 2010.[12][13]

Herzog committed suicide in January 2012, hanging himself inside his trailer.[11] He did so shortly after bounty hunter Leonard Padilla informed Herzog that Shermantine was planning to disclose the location of a well and two other locations where the duo buried their victims. Previously, none of their victims' bodies had been found. Both men maintained that the other did the killing in all cases.[14]

Since 2012, several victims' families and elected officials have alleged that the San Joaquin County Sheriff's Office (SJCSO) interfered with and deliberately hampered the continued search for additional possible victims of the "Speed Freak Killers".[23]

In 2010, Shermantine wrote a letter to California State Senator Cathleen Galgiani—whose cousin, 19-year-old Dena McHan, disappeared in 1981—revealing the locations of the remains of additional victims.[24] In 2012, Galgiani sponsored the use of taxpayer funds to search for additional victims of the pair, and sought to simplify protocol granting incarcerated persons like Shermantine permission to participate in search excursions.[24] Galgiani turned the letter over to law enforcement and later alleged that missing persons records related to the "Speed Freak Killers" case had been deleted, hampering further investigation.[25]

In 2014, the mother of a missing woman filed suit against the SJCSO for mishandling the remains found in the Linden well.[26] In 2015, a retired FBI agent corroborated her claims, alleging that the SJCSO deliberately used a backhoe to dig up remains, mangling them to prevent identification, so that the absence of certain files would not be discovered.[23]

In 2018, the Sheriff-elect of San Joaquin County announced that the "Speed Freak Killers" case would be re-opened.[27]

It is unknown if the duo were involved in other disappearances or murders.

Original sketches of the man seen kidnapping Garecht

On November 19, 1988, Michaela Garecht, aged nine, was kidnapped. In 2015, a legal motion was filed by attorney Mark Geragos[28] on behalf of a detective who was informed by a San Joaquin sheriff's deputy that a pair of Mary Jane shoes discovered in one of the Linden wells bore similarity to the shoes Garecht was last seen wearing.[29] According to the detective, San Joaquin police refused to show him the shoes, both physically as well in photographs, and, as of March 2015, the shoes had not been examined by the Hayward Police Department.[29]

This case was featured on episode 178 of the series American Justice, "Vanished", which first aired September 4, 2002.[30] With the episode's 2002 production date, newer details relating to this case were not a part of the program. Two of the victims' families (the Wheelers and Vanderheidens) did not yet know where their daughters' bodies were, and Herzog was (still) serving a 78-year sentence.

The story was covered on the 2015 episode “Where Evil Lives”, on the crime documentary series On the Case with Paula Zahn. The episode included updates on Herzog’s release and suicide, and the discovery of victims’ remains, including Wheeler and Vanderheiden—with comments from Wheeler‘s and Vanderheiden’s families.

• List of serial killers in the United States
• List of serial killers by number of victims

• "The Speed Freak Killers", extensive reportage by Gary C. King, TruTV site