A Los Angeles man was charged Monday with murder in the 1996 killing of Claudia Guevara, a 23-year-old who disappeared after being dropped at a bus stop and was found dead a day later in a drainage ditch, prosecutors said.
The filing closes a long-running mystery for a family that reported Guevara missing nearly three decades ago and for investigators who kept the case open while forensic technology advanced. Prosecutors said DNA evidence now links Brian Walton, 63, to the killing, which they allege occurred during a sexual assault. Walton was arrested Feb. 5 and faces a murder charge with special-circumstance allegations that could lead to life in prison without parole or the death penalty if he is convicted, authorities said.
Guevara was living with her older brother in Temple City when she vanished, authorities said. On Feb. 20, 1996, her brother reported her missing after she did not return home. Investigators said she had been dropped off at a bus stop in El Monte by two co-workers earlier that day and was never seen again. The next day, authorities said, her nude body was found in a drainage ditch next to Encanto Parkway in the Azusa area. Forensic investigators determined she had been sexually assaulted and stabbed in the neck, prosecutors said.
Los Angeles County District Attorney Nathan J. Hochman said the case delivered a long-awaited development for people who had spent years without answers. “The victim’s family has waited for an agonizing 30 years to get that call to let them know their loved one’s killer had been found and charged,” Hochman said in a statement announcing the filing. He said the case showed how investigators continue pursuing cold cases even when leads grow scarce, with new science sometimes providing the break that older methods could not.
Walton was charged in Los Angeles County Superior Court with one count of murder, prosecutors said. The complaint includes special-circumstance allegations that the killing occurred during the commission of rape and during the commission of sodomy, authorities said. Prosecutors said Walton did not know Guevara, a detail that has shaped how investigators describe the case: a young woman last seen in a public place, and a homicide in which the alleged suspect had no known connection to her at the time. Officials did not disclose in the charging announcement how investigators believe Walton encountered Guevara after she was dropped at the bus stop.
The case remained under investigation by the Los Angeles County Sheriff’s Department’s Homicide Bureau, prosecutors said, while the Major Crimes Division of the district attorney’s office is handling the prosecution. Beth Silverman of the Major Crimes Division is assigned to the case, authorities said. Officials also did not provide details about what evidence existed in 1996 beyond the initial forensic findings, what earlier leads were pursued, or how the investigation shifted as DNA analysis improved. Law enforcement agencies across the country have increasingly used newer testing methods to revisit evidence retained from older cases, sometimes generating profiles that can be compared with modern databases.
Prosecutors said DNA evidence linked Walton to the crime and formed the basis for the charge. They did not describe whether the DNA was developed from evidence collected at the scene, from a sexual assault kit, or from other items, nor did they say whether investigators relied on newer techniques such as advanced STR testing, Y-STR analysis, or investigative genetic genealogy. Authorities also did not release information about whether Walton had been a person of interest previously or whether the case had gone years without a viable suspect. Those details are often addressed later through court filings, evidentiary hearings, and testimony as defense lawyers challenge the methods used to develop and interpret forensic results.
Walton was arraigned Feb. 9 at the Foltz Criminal Justice Center, officials said. His next court appearance was scheduled for March 18, according to reports of the case calendar. Prosecutors said he is presumed innocent unless and until proven guilty, and they did not outline what plea he entered at arraignment in the initial announcement. If convicted as charged, Walton faces life in prison without the possibility of parole or the death penalty, prosecutors said, adding that a decision on whether to seek capital punishment would be made later.
The possibility of a death sentence is tied to the special-circumstance allegations, which under California law can expose a defendant to the harshest penalties when prosecutors prove the killing occurred during certain felonies. In court, prosecutors would still need to prove the underlying allegations beyond a reasonable doubt, and defense attorneys could seek to exclude evidence or argue that forensic conclusions are overstated. The case is also likely to draw attention because it involves a homicide investigation that spans different eras of policing and forensic work, raising questions about chain of custody, recordkeeping, and how evidence was preserved.
Guevara’s disappearance and death occurred in the San Gabriel Valley at a time when public awareness of stranger violence was high and many agencies had limited tools to identify unknown suspects. Investigators often relied heavily on eyewitness accounts, tip lines, and traditional comparisons of fingerprints or blood types. Over time, DNA profiling became more powerful and widespread, allowing authorities to revisit evidence from older cases and compare genetic material against known offenders or new leads. For families, that shift has sometimes meant a new call after years of silence, followed by a fast-moving court process that reopens old grief in a public forum.
In announcing the charge, prosecutors did not provide information about Guevara’s work, her plans the day she went missing, or what her co-workers told detectives in 1996 about dropping her off at the bus stop. Authorities also did not say whether investigators believe the killing happened soon after she was last seen, or where they think she was taken before her body was left in the drainage ditch. The location where she was found, along Encanto Parkway near Azusa, sits near foothill terrain and flood-control infrastructure that can be isolated, especially at night, and investigators often examine how a suspect could access such an area without being noticed.
Officials said Walton is from Los Angeles and was 63 at the time charges were filed. Prosecutors did not provide his employment history or where he lived in 1996, details that can become part of courtroom arguments about opportunity, travel patterns, and possible explanations for the presence of DNA. Investigators also did not disclose whether they recovered any additional physical evidence tying Walton to the scene beyond the DNA profile. In older cases, prosecutors may lean on a combination of forensics, timelines, and any statements a suspect makes after arrest.
While the charging announcement focused on the DNA link, it also underscored that the investigation is not over. Authorities said the matter remains under investigation, language that can indicate detectives are still working to confirm the full timeline, locate additional witnesses, and track down records from 1996 that may be incomplete or stored in archives. In cold cases, investigators often re-interview people who were around the victim in the days before a disappearance, revisit old tip sheets, and seek to identify anyone who may have knowledge about where a victim went after being last seen.
For the criminal justice system, the case now moves from investigation to prosecution, a stage that can take months as attorneys exchange evidence and litigate the admissibility of forensic findings. Defense lawyers are expected to review lab reports and testing notes and may request independent analysis. Prosecutors, meanwhile, must prepare to explain how evidence was collected in 1996, how it was stored, what testing was performed over the years, and how they concluded the DNA profile belongs to Walton. Those questions can be central when jurors evaluate evidence created decades after a crime occurred.
Walton remained in custody after his arrest, and officials said the next major step will be the March 18 court date, when the case is expected to proceed through early hearings. Prosecutors said they will decide later whether to seek the death penalty. For now, the public record reflects a woman last seen at a bus stop in El Monte, a body found in an Azusa-area drainage ditch, and a DNA match that investigators say finally led them to a suspect nearly 30 years later.
Author note: Last updated February 10, 2026.