The unsolved death of a teenager in 1977 haunted students and staff at Honolulu's McKinley High School for nearly half a century.

Honolulu Police and the Unified Police of the Greater Salt Lake say they have arrested a 66-year-old man in a Utah nursing home in connection to a Hawaii murder nearly 50 years ago.

DNA technology has led to the arrest of 66-year-old Gideon Castro, who attended the same high school as the victim, Dawn Momohara.

Honolulu Police say modern forensic tests allowed them to identify and arrest a suspect in Dawn Momohara's 1977 murder.

In 2018, improperly prepared vaccines — after nurses mixed doses with muscle relaxants instead of water — led to the deaths of two Samoan children. The incident sparked widespread mistrust in the vaccine program, including from Samoa’s prime minister, who suspended MMR immunizations altogether.

Nearly a half-century after Dawn Momohara’s body was found, Gideon Castro, 66, was arrested in a Utah nursing home and charged with her murder.

Dawn Momohara was 16 years old when her body was found on the second floor of McKinley High School in Honolulu in 1977. For decades, detectives had failed to identify a suspect in the murder case but now, thanks to a breakthrough in DNA technology, they have arrested a former classmate, police confirmed.

Susie Chun Oakland arrived to a crime scene at McKinley High School in Honolulu that March morning nearly a half century ago.

Today at 7:40 a.m. Hawaii time, the Mill Creek Investigations ... HPD investigators flew to Utah and covertly acquired a DNA sample from Gideon Castro that matched the evidence found on Momohara ...

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Dawn Momohara was found dead in a building on her high school's campus in Honolulu. A suspect was arrested in a Utah nursing home.