Brandon and Alex lived in the Genesis Way townhouse with the teen’s two younger siblings and mother, Brandon’s wife, police said. The teen’s mother and siblings were not home at the time of the shooting.
But teenagers who knew Alex said the junior at Alpharetta High School had previously complained about this stepfather.
Alex Messing, who called himself Koser’s best friend, told The AJC two days after the shooting that Alex Koser and his stepfather “were always arguing.”
Before his death, Alex Koser was known as a poet and cartoonist.
“He was very good at animation,” Messing said.