Murder of Cara Knott

Peyer's own logbook revealed a hasty falsification about that time as well as changes he made to several traffic tickets that had been written some time later, according to the motorists to whom the tickets were written. Forensic dentist Norman Sperber examined the rope found in his patrol car, and he determined they seemed to match the rope marks around the victim's neck, although Sperber was later barred from testifying about his findings in court. A distinctive and unusual gold rayon fiber—found to have been made using a yellow pigment instead of a dye—found on Knott's dress matched a shoulder patch Peyer wore on his CHP uniform. Tire tracks on the bridge showed a car had pulled out hastily leaving black marks on the pavement. Furthermore, a drop of blood was found on one of Knott's boots, which was found to be consistent with Peyer's blood type (AB negative, the rarest type) and other genetic markers, although conclusive DNA testing was not available at the time of the investigation. Microscopic purple fibers also linked Peyer to Knott's murder.

Peyer has been denied parole two additional times: in 2008 (served 21 years), and 2012 (25 years). His next eligibility for parole hearing was set to 15 years (longest time allowable under state law) from then to January 2027 (40 years in prison); he will be 77 years old. Peyer is serving his sentence at California Men's Colony in San Luis Obispo, California, which is considered a "country club" and "garden spot" among California prisons. At the time of his second parole hearing in 2008, he had "a nearly unblemished prison record" and "worked as an electrician at the facility" for years, making $52 per month in salary from the job in 2003. He worked briefly as an apprentice electrician after getting fired from CHP while on bail before the trial. His third wife Karen whom he married 18 months before the murder and who visited him regularly divorced him around 2007. Around 2010, his elderly parents, who used to visit him every other month, died.

After conviction, Peyer continued to claim his innocence. In 2004, Peyer was asked if he would contribute a sample of his DNA to a San Diego County program, which had been designed and initiated to use DNA samples to possibly exonerate wrongfully imprisoned persons, because such testing was not yet available at the time of his trial and conviction. Peyer refused to provide any DNA for the test. At an initial parole hearing in 2004 after having served 17 years, when asked why he wouldn't provide a DNA sample, Peyer refused to answer. The board denied his parole, on the grounds of his lack of remorse for the crime, as well as for his refusal to explain why he was saying he was innocent yet would not let anyone help him prove it.

On December 2, 2000, Sam Knott, Cara Knott's father, died of a heart attack several yards from the site where Cara's body was discovered, where the family had constructed a memorial garden for her.

The first trial resulted in a hung jury. Upon retrial, testimony regarding a potential second suspect and a hearsay explanation for the defendant's scratches was ruled inadmissible, and Peyer was found guilty of murder, the first conviction of murder by an on-duty CHP officer. On August 4, 1988, Peyer was sentenced to 25 years to life.

On the night of December 27, 1986, 20-year-old Cara Knott was driving south on Interstate 15 from her boyfriend's home in Escondido, California, to her parents' home in El Cajon when Peyer, who was on duty in a marked CHP patrol car, directed Knott to pull off the freeway on an isolated, unfinished off-ramp. It was later discovered that Peyer also had been harassing several other female drivers in the same area by pulling them over on the same off-ramp, supposedly trying to pick them up as dates. In the Knott case, it was believed that the situation escalated to physicality when Knott threatened to report Peyer for his inappropriate actions. When he attempted to grab her, she slashed and scratched at his face. Peyer then bludgeoned her with his flashlight and strangled her to death with a rope. He then threw her body over the edge of an abandoned bridge, where she fell into the brush below.

Cara Evelyn Knott (February 11, 1966 – December 27, 1986) was an American student at San Diego State University who disappeared on December 27, 1986, while driving from her boyfriend's home in Escondido, California, to her parents' house in El Cajon. The following day, December 28, her car was found below a 65-foot bridge at the bottom of a ravine, near an abandoned off-ramp in San Diego County.

Her killer, Craig Allen Peyer (b. March 16, 1950), was a police officer and 13-year veteran of the California Highway Patrol (CHP). At Peyer's trial, it was revealed that he had been targeting women along the interstate and had made predatory sexual advances on multiple female drivers. He was convicted of Knott's murder in 1988.