Arlene Holmes , whose son Robert killed 12 in massacre , has spoken out . Prayed prosecutors would abandon death penalty for 2012 killings . Trial for 27-year-old 's shooting spree in Aurora , Colorado , begins in April . Holmes also insisted that she and husband James are not to blame . Believes her son is mentally ill and as such should not be put to death .
Arlene Holmes , whose son James killed 12 in massacre , has spoken out . Prayed prosecutors would abandon death penalty for 2012 killings . Trial for 27-year-old 's shooting spree in Aurora , Colorado , begins in April . Holmes also insisted that she and husband Robert are not to blame . Believes her son is mentally ill and as such should not be put to death .