Ingrid Lori Ostrenga was 27 when she was found dead inside her Kailua residence on Oʻahu on December 24, 1975. Detectives determined she had been strangled; later accounts say an electrical cord was used. The killing took place in her own home, making the scene particularly intimate and raising the central question of who had access to her life and why they were there that night.

Friends and acquaintances remembered Ostrenga’s life moving between late nights and early mornings—dancing at the nightclub El Morocco and riding horses on the Windward side—details police used to map her routine and social circles. Those overlaps between nightlife, acquaintances, and daily activities were avenues investigators pursued while seeking someone who fit the crime.

Does anyone who knew Lori, her routines, or her companions in 1975 have information that could help finally close this case?