The 12 people pictured were mostly all killed in the same manner which was hanging from a doorknob, usually by a red scarf.

The original 12 in order of their deaths are,

Michael Hutchence. Died November 22, 1997
David Carradine. Died June 3, 2009
Alexander McQueen. Died February 11, 2010
Aaron Swartz. Died January 11, 2013
L’Wren Scott. Died March 17, 2014
Robin Williams. Died August 11, 2014
Chris Cornell. Died May 18, 2017
Chester Bennington. Died July 20, 2017
Avicii. Died April 20, 2018
Kate Spade. Died June 5, 2018
Ines Zorreguieta. Died June 6, 2018
Anthony Bourdain. Died June 8, 2018

While Avicci was not found hanging, his neck injuries were consistent with strangulation. A message was clearly being sent but this was not political but rather spiritually motivated as most victims were tied to exposing pedophilia in Haiti, DC, Hollywood and the music industry.