"To my sweet Christopher, you were the best father, husband and son-in-law. Your patience, empathy and love always showed through," she wrote in the letter posted on Billboard.com
. "You had always said I saved you, that you wouldn't be alive if it were not for me. My heart gleamed to see you happy, living and motivated. Excited for life. Doing everything you could to give back. We had the time of our lives in the last decade and I'm sorry, my sweet love, that I did not see what happened to you that night. I'm sorry you were alone, and I know that was not you, my sweet Christopher. Your children know that too, so you can rest in peace."