Sorry to hear about your friend and the other stories on here. Heart disease, heart attacks, and strokes are becoming known as the "toothless tiger" or "paper tiger" because heart disease is preventable and reversible with a low-fat, whole foods, vegan diet as advocated by a number of vegan doctors and vegan nutritionists.
Here are some good resources for your friend (and for anyone that wants to learn about heart attack/stroke/heart disease prevention/reversal:
~ The documentary called
Forks Over Knives http://www.forksoverknives.com/~ Dr. John McDougall's website and books http://
www.drmcdougall.com (tons of great, free information, poke around his website)
~ The book
Prevent and Reverse Heart Disease by Caldwell B. Esselstyn, Jr. MD
The movie Forks Over Knives is a very good starting point for most people. From there, many people have changed their lives.
The diet to follow is not only vegan and whole plant foods, but no oil or butter. That is important to the endothelial cells in the blood vessels (explained very well in the Prevent and Reverse Heart Disease book in the chapter about oil).
Good luck!