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Arrest Made in 1970s Cold Case Sexual Assault and Homicide of Teenager

News RoomBy News RoomJanuary 27, 2025
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The brutal murder of 16-year-old Dawn Momohara, a sophomore at McKinley High School in Honolulu, Hawaii, in March 1977, remained a chilling unsolved case for nearly five decades. Momohara was discovered lifeless on the second floor of the school, partially clothed, with an orange cloth tightened around her neck, bearing evident signs of sexual assault. The horrific discovery shook the community and launched a comprehensive investigation that, despite initial efforts, yielded no definitive leads, leaving the promising young life tragically cut short and her family burdened with unanswered questions.

In the immediate aftermath of the crime, Honolulu police conducted extensive interviews, including questioning two brothers, Gideon and William Castro, who were classmates of Momohara. While a sketch of a potential suspect and the description of a Pontiac Lemans seen near the school on the night of the murder were circulated publicly, the investigation eventually stalled, leaving the case cold for decades. The lack of concrete evidence and technological limitations at the time hindered investigators’ ability to identify and apprehend the perpetrator. The image of the young victim and the unresolved nature of her death haunted the community and served as a constant reminder of the tragic loss.

The turning point in the long-cold case came in 2019 when Honolulu Police Department detectives, driven by a renewed commitment to solving the decades-old crime, revisited the evidence collected from the original crime scene. Leveraging advancements in DNA technology, they re-examined key items, including underwear and a pair of blue shorts, hoping to uncover crucial genetic information that could finally lead them to the killer. This decision proved to be a pivotal moment in the investigation, breathing new life into the pursuit of justice for Dawn Momohara.

The meticulous analysis of the crime scene evidence yielded a breakthrough in 2020 when a DNA profile of the suspect was successfully generated. This critical development presented a renewed opportunity to identify the perpetrator and bring closure to the decades-long mystery. The DNA profile was then entered into national databases, enabling investigators to compare it with known offenders and potential matches across the country. The quest for justice continued, with the hope that the DNA profile would finally unveil the identity of Momohara’s killer.

Earlier this month, the relentless pursuit of justice culminated in a significant breakthrough. With the assistance of the FBI and Homeland Security, the DNA profile generated from the crime scene evidence was matched to Gideon Castro, one of the brothers initially interviewed in 1977. Now 66 years old, Castro was located residing in a nursing home in the Salt Lake City area, a world away from the scene of the crime nearly half a century ago. The match provided the long-awaited link between Castro and the murder of Dawn Momohara, finally bringing the decades-long search for the perpetrator to an end.

Following the DNA match, authorities moved swiftly to apprehend Castro, charging him with second-degree murder. He is currently awaiting extradition to Honolulu, where he will face trial for the crime that has cast a long shadow over the community. The arrest of Gideon Castro marks a significant victory for law enforcement and offers a sense of closure to Dawn Momohara’s family and friends, who have endured decades of unanswered questions and the agonizing pain of not knowing who was responsible for her tragic death. The case serves as a testament to the power of perseverance and the transformative impact of advancements in forensic science, demonstrating that even after decades, justice can still be served.

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