Dr. Thomas Noguchi one of the most recognized forensic pathologists in the United States, has returned to public attention following renewed interest in his decades-long career.
Dr. Noguchi served as the Chief Medical Examiner-Coroner of Los Angeles County from 1967 to 1982. During his career, he examined the deaths of several well-known public figures, including Marilyn Monroe, Senator Robert F. Kennedy, Natalie Wood, John Belushi, and William Holden. His findings became part of official investigations and demonstrated how medical evidence contributes to legal and criminal proceedings.
Dr. Thomas Noguchi was born in Japan into a family of physicians, with his father, Dr. Wataru Noguchi, practicing medicine in Yokosuka. After World War II, he moved to the United States in 1952 to continue his medical career.
Soon after arriving, doctors suspected that he had early-stage tuberculosis, leading to an 18-month stay at Barlow Sanatorium. During his treatment, he met Hisako, a research assistant studying the bacteria responsible for tuberculosis. The two later married.
Although Dr. Noguchi graduated from Nippon Medical School in Tokyo, securing medical training in the United States proved challenging. He reportedly applied to nearly 200 internship programs before receiving offers from only two institutions, Johns Hopkins Hospital and Orange County General Hospital. He chose to train at Orange County General Hospital and joined the Los Angeles County Medical Examiner's Office in 1961.
Before joining the Los Angeles County Medical Examiner's Office, Dr. Noguchi completed medical training at Orange County General Hospital and additional pathology training after arriving in the United States. His early struggles in securing medical training reflected the barriers faced by many immigrant physicians during that period.
Just a year later, while serving as a deputy medical examiner, he gained national attention after conducting the autopsy of Hollywood actress Marilyn Monroe.
One of the earliest high-profile cases in Dr. Thomas Noguchi's career was the death of Hollywood actress Marilyn Monroe in 1962. As a deputy medical examiner with the Los Angeles County Medical Examiner's Office, he conducted the autopsy and led the forensic investigation.
He told Variety,
It was a challenging assignment. We conducted not only a coroner’s investigation but requested to have a panel of experts on suicide prevention and suicide determination, and that way [there was] a more scientific determination.Dr. Thomas Noguchi
A panel of experts on suicide prevention conduct what is now known as a psychological autopsy—a forensic procedure that reconstructs a person's mental state prior to death to help determine the manner of death.
According to Dr. Noguchi, the investigation extended beyond the routine post-mortem examination. The medical examiner's office sought input from specialists in suicide prevention and suicide assessment to support the final determination using both forensic evidence and clinical information.
The autopsy identified high concentrations of barbiturates in Monroe's body. Investigators also reviewed reports documenting her history of chronic depression and significant mood changes. Based on the combined medical, toxicological, and investigative findings available at the time, the official cause and manner of death were classified as probable suicide.
According to Dr. Noguchi, the investigation also involved consultation with the Los Angeles Suicide Prevention Team, which reviewed Monroe's psychiatric history alongside the forensic findings before the official determination was reached.
Although Monroe's death has remained the subject of numerous books, documentaries, and conspiracy theories over the decades, the official forensic conclusion has not changed.
Dr. Noguchi has consistently maintained that his findings were based solely on scientific evidence collected during the investigation and not on public speculation surrounding the case. According to Variety, he said,
Especially well-known cases attract rumors and exaggerated stories regarding the investigation, and people tend to believe what they hear. It’s my job to conduct an investigation and an autopsy, and to come to a scientific determination of the cause of death rather than speculation.Dr. Thomas Noguchi
The investigation brought national attention to Dr. Noguchi's work and established him as one of the best-known forensic pathologists in the United States. In 1967, following the retirement of his mentor, Dr. Theodore Curphey, he was appointed Chief Medical Examiner-Coroner of Los Angeles County. Despite reportedly facing racial barriers during the selection process, he became the first person of Asian descent to hold the position, where he went on to oversee several other nationally significant death investigations.
In 1968, Dr. Thomas Noguchi led the autopsy of Senator Robert F. Kennedy following his assassination at the Ambassador Hotel in Los Angeles. His detailed forensic report concluded that Kennedy sustained three gunshot wounds, with the fatal bullet entering behind the right ear at close range. To support the findings, Dr. Noguchi supervised ballistic testing that compared gunpowder residue patterns from experimental shots with those observed during the autopsy.
Dr. Noguchi's autopsy documented that the fatal gunshot entered behind Kennedy's right ear from an estimated distance of less than three inches. Although this finding later fueled conspiracy theories, Dr. Noguchi repeatedly stated that the autopsy itself did not identify the shooter and only documented the medical evidence.
The report later became the subject of public debate because some questioned how the fatal shot aligned with witness accounts of the shooting. Dr. Noguchi consistently maintained that the autopsy findings were scientifically accurate, explaining that the position of the victim's head could have changed rapidly during the incident, affecting the bullet's trajectory, as reported in Variety.
If the senator was looking at the assailant it does not make sense that it came from the back. However, the position of the head changes rapidly, especially, as I understand, as the senator was shaking hands with kitchen staff. His head could have moved and changed position, which is important in understanding how it happened. Sirhan Sirhan was in front of the senator, however, if he moved to the position of looking toward his right, the situation changes completely.Dr. Thomas Noguchi
The high-profile investigation also brought intense public and political scrutiny. During the controversy that followed, Dr. Noguchi briefly submitted his resignation before withdrawing it. He later stated that he had faced unfair treatment during the episode while continuing to stand by the scientific conclusions of the forensic investigation.
After returning as Chief Medical Examiner, Dr. Thomas Noguchi investigated the 1981 death of actress Natalie Wood, whose body was recovered from waters near Santa Catalina Island.
Based on the autopsy and available evidence at the time, he concluded that the cause of death was accidental drowning and hypothermia. The investigation also documented bruises, scratches, and an elevated blood alcohol level, leading investigators to suggest that Wood may have fallen into the water while attempting to board a dinghy.
In 2011, Los Angeles authorities reopened the case after new witness statements emerged. The following year, the death certificate was amended to list the cause of death as "drowning and other undetermined factors," stating that the circumstances leading to her entering the water could not be clearly established. In 2013, the coroner's office added further observations indicating that some of the injuries may have occurred before she entered the water.
Despite the later updates to the official records, Dr. Noguchi has stated that he continues to stand by the conclusions reached during the original forensic investigation based on the evidence available at that time, as reported in Variety.
Many famous cases from my career continue to generate public interest and debate. I understand why people remain curious, and I respect that others may hold different opinions. However, my conclusions were based on the medical and forensic evidence available to me at the time, and those conclusions are reflected in the official autopsy reports. After all these years, I continue to stand by those findings. Whether the case involved a famous person or an unknown citizen, the duty was always the same.Dr. Thomas Noguchi
Dr. Thomas Noguchi's practice of publicly releasing forensic findings in several celebrity death investigations, including those of Natalie Wood and actor William Holden, drew criticism from some public figures. Following complaints and reports alleging administrative issues within the Los Angeles County Medical Examiner's Office, Los Angeles County removed him from his position as Chief Medical Examiner in 1982.
Members of Los Angeles' Japanese American community had earlier successfully campaigned for his reinstatement after an earlier resignation controversy in 1969, making his career one of the most publicly debated in American forensic medicine.
After leaving the office, Dr. Noguchi was appointed as a Professor of Forensic Pathology at the University of Southern California (USC). Based at the LA County + USC Medical Center, he dedicated the next several decades of his career to academic medicine, mentoring the next generation of forensic pathologists, and publishing seminal books on death investigation.
At 99 years of age, Dr. Thomas Noguchi remains active in the medical community. He continues to attend national and international medical conferences and has maintained his medical license by staying engaged with developments in forensic pathology.
He was also awarded Japan's Order of the Sacred Treasure in 1999 in recognition of his contributions to forensic science and later served as president of the World Association for Medical Law.
Although he no longer serves as a chief medical examiner, his decades of work in death investigation and forensic medicine continue to be recognized within the field.
Dr. Noguchi told Variety,
I’m the same animal, always observing.Dr. Thomas Noguchi
His career, spanning some of the most high-profile forensic investigations in the United States, highlights the enduring role of scientific evidence in determining the cause and manner of death and the continuing importance of forensic pathology in medicine and public health.
(Rh/SS/MSM)