Tanner McKenzie Ernest was 17 when he was fatally shot at his family’s home in Livingston Parish, Louisiana, on the morning of January 26, 2019. His 20-year-old sister Summer and their 43-year-old father Billy Ernest were killed in the same attack. The shooter was identified as 21-year-old Dakota Theriot, who had been in a relationship with Summer and was living with the family after being asked to leave his own parents’ home.

After the killings in Livingston Parish, the suspect fled in Billy Ernest’s pickup truck and drove to Ascension Parish, where he shot his parents; his father was able to identify him before dying of his injuries. A multi-state search ended the next day when Theriot was arrested at his grandmother’s home in Virginia and taken into custody.

What details about Tanner’s life or movements that morning might help shed more light on why this happened?