A Nashville family was shattered on January 18, 2015, when gunfire at an apartment on Neese Drive left 54-year-old Janet Irene Boone and her 27-year-old son Frank Boone dead. Police found Frank deceased on the apartment floor and Janet critically wounded in a bedroom; she was taken to Vanderbilt University Medical Center and pronounced dead shortly after arrival.

A pistol was recovered in the apartment. The next day a 23-year-old man identified as Mark Silas Sebastian — described in reports as Janet’s son and Frank’s brother — approached a police officer downtown and confessed to the killings, saying he did not know why he had shot them. Sebastian was arrested and charged with two counts of criminal homicide and held on $500,000 bond.

What details about the family, the apartment, or the events that morning might help explain how this tragedy unfolded?