Two people were arrested Friday in connection with a massive New Year’s fireworks explosion in Honolulu, Hawaii, that killed at least three people and injured two dozen more.

Police have finally arrested a suspect in a nearly 50-year-old cold case in which a Hawaii teenager was found dead at her high school. Dawn Momohara was 16 years old when her body was found on the second floor of McKinley High School in Honolulu in 1977.

A grim discovery was made at a Hawaii high school in 1977, one that would pose a mystery for decades. Student Dawn Momohara, 16, was found dead inside McKinley High School on Monday, March 21, 1977, according to the Honolulu Police Department.