The red and black color theme in the shooting makes me think of the Jesuits, or the 'Society of Jesus'. The coding also synchs up with this witness.
191 is the 43rd prime number, connecting back to 'Civil War'.
His name connects to 'kill' and a number stamped on black men often.
Also, regarding the name of the mart, "Triple S", it has a connection to the date.
S+S+S = 19+19+19 = 57 (July 5, or 5/7 shooting) (Scottish Rite = 57)