Husband Killer Tracey Grissom

Claiming to be a victim of rape and other abuses, a distraught Tracey Grissom would travel to her ex-husband Hunter's workplace and shoot him six times in the back, receiving a twenty-five-year life sentence for his murder. 
Her defense attorney would argue that Tracey was motivated by post-traumatic stress disorder caused by her Hunter's constant abuse and sexual assaults. One jury member had even asked the judge to be lenient in her sentencing as they were not allowed to hear details of her Hunter's alleged abuses (beatings, rape, sodomy). 
But what really happened in the years that led up to May 15th, 2012? Was she in fact the victim of years of abuse by a psychotic husband? Or did she want to cash in on his $100,000 life insurance policy?