it was very difficult, very difficult time. i don't even like to really go through. >> kristy kiernan doesn't want to go back to that day in 2011 when her husband shawn kiernan overdosed on prescription drugs. >> it was the most terrible and horrifying thing i've ever been through. >> did you want to die? >> i just wanted to end that second. it was i want it to end. i want it to stop. >> shawn kiernan wanted it to end because the drugs that he hoped would save him were killing him. >> i just wanted it to end. i did something. thank god it wasn't permanent. >> 22 united states veterans kill themselves every day.