On December 19, 1975, four-year-old Cassandra Harrington, her nine-year-old sister Pamela, and their 28-year-old mother Becky were killed in their Detroit home. The accused was their father and husband, Paul Harrington, described in reports as a Detroit police officer and a Vietnam veteran who had been struggling with his mental health.

After the killings, Paul Harrington reportedly called authorities, surrendered, and led them to the scene. He was arrested and charged with the three murders. At a 1977 hearing a judge found him not guilty by reason of insanity and he was committed to a state psychiatric hospital; records indicate he was released after a couple of months.

What can readers add about the Harrington family or the 1975 case that might help preserve their memory or shed light on unresolved questions?