Grover Beach man sentenced for 2018 murder
Grover Beach resident Robert W. Koehler, IV, 40.
Robert W. Koehler sentenced to 56 years to life in prison
– Grover Beach resident Robert W. Koehler, IV, 40, was sentenced to 56 years to life in prison for the Jan. 2018 murder of 26-year-old Kristen Marti, who remained missing for over two months, announced San Luis Obispo County District Attorney Dan Dow this week.
Kristen Marti went missing on Jan. 9, 2018. Following a nearly three-month search, Marti’s remains were found in a remote area of Prefumo Canyon in San Luis Obispo on March 25, 2018. Computer forensics and other investigative tools led law enforcement to identify Koehler as the suspected murderer.
Evidence introduced at trial revealed that Koehler contacted Marti using secretive social media apps in order to entice her to his location through his persistent offer of providing her with cocaine. Although Marti’s body was found in a stream buried under rocks, the forensic medical examination revealed cocaine and tiletamine, a drug that causes a human body to become immobilized, in her bloodstream. In addition, she was found to have suffered numerous knife wounds to her throat and wounds indicating that she had fought back to protect herself from the violent attack.
After an eight-week jury trial, on July 14, 2022, a San Luis Obispo County jury convicted Koehler of first-degree murder with the use of a knife. The jury also found that Koehler had previously been convicted of carjacking, a “strike” under California’s Three Strikes law.
This week’s sentence of 56 years to life in prison, which was ordered by San Luis Obispo County Superior Court Judge Jesse Marino, was the maximum allowed based on Koehler’s conviction.
“Today, we finally have justice for Kristen Marti five years after she was brutally murdered,” said Dow. “This defendant should spend the rest of his life in state prison and today’s sentence should make that possible. We are grateful to each of our law enforcement partners and search and rescue volunteers who never gave up searching for Kristen. Finally, we must thank the members of the jury for their service and their verdict that made today’s just sentence possible.”
At the sentencing hearing several family members, including Marti’s mother and father, described to the court the devastation and sadness resulting from the loss of Marti.
This case was investigated by the San Luis Obispo Police Department with assistance from the San Luis Obispo County Sheriff’s Office and the District Attorney’s Bureau of Investigation and the District Attorney’s Central Coast Cyber-Forensic Laboratory. The prosecution team was led by Chief Deputy District Attorney Lisa B. Muscari who supervises sexual assault, child abuse, intimate partner violence, juvenile, and mentally disordered offender prosecutions.
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