Melinda Ann Garza was a 2-year-old Hispanic girl from Friona, Texas, who died on August 17, 1982. Her death was originally recorded as acute heart failure due to congenital heart disease and no autopsy was performed, so it did not prompt suspicion at the time. Melinda was one of several children who died while in the care of their mother, Diana Lumbrera, between 1976 and 1990.

A pattern of fatalities in the family drew renewed scrutiny after the May 1, 1990 death of Lumbrera’s 4-year-old son José Antonio Lumbrera in Garden City, Kansas. An autopsy on José Antonio showed signs consistent with smothering, triggering a broader investigation into the earlier child deaths, including Melinda’s. As a result, Diana Lumbrera was arrested on May 5, 1990; she was later convicted in Kansas for José Antonio’s murder and received life imprisonment, and Parmer County convictions in Texas named Melinda Ann Garza and Melissa Garza as murder victims, each resulting in life sentences.

What details about Melinda’s life or the family’s history might help explain how these deaths were initially accepted as natural causes?