Myriam Dienes, 56, was found dead of gunshot wounds in her Carrollwood home in Tampa on August 20, 2015. Her 67-year-old husband, Robert Dienes, was also found shot and killed at the scene. The Hillsborough County Sheriff’s Office led the investigation into the double homicide.

The primary suspect named in the case was Myriam’s 21-year-old daughter, Nicole Nachtman, who was a student at Florida State University. Investigators say Nicole drove from Tallahassee to Tampa and that neighbors reported hearing gunshots and seeing a shadowy figure near the Dienes’ home around the time of the killings. Nicole was arrested and charged with two counts of first-degree murder; reports during the case described competing claims about motive and Nicole’s mental health.

What details about the night of August 20, 2015, might help explain how this crime unfolded?