In the summer of 2014, four-year-old Lily Lilly Anne Smith was found dead in her family’s Saco, Maine, apartment on Saturday, July 26, 2014, as part of a larger family tragedy. Authorities say Lily, her mother Heather Smith and two older brothers, 12-year-old Jason Montez and 7-year-old Noah Montez, were shot and killed by Lily’s father, Joel Smith, who then took his own life in a murder-suicide.

The Maine State Police investigation concluded the deaths occurred late on a Saturday night inside the family home. Neighbors described shock and disbelief, recalling Joel Smith as a loving father; some friends later reported he had been depressed and had made threats of suicide in the week before the killings. The community held a candlelight vigil in the days that followed to mourn the family.

What details about the family’s interactions or warning signs around that week might help explain how this escalated so suddenly?