For Tony Stewart, the tragic sprint car racing accident that led to the death of Kevin Ward Jr. "has been the toughest and most emotional experience of my life and it will stay with me forever".

This statement from the three-time NASCAR champion came out after the grand jury news conference where Ontario County District Attorney Michael Tantillo said "there was no evidence to charge Tony Stewart with a crime."

Can he now move on with his life following this grand jury decision?

Stewart admitted that he spent three weeks alone and quiet in his Indiana home. He neither wanted to talk nor be with anyone. He did not think about racing. He was in grief.

"I know 100 percent in my heart and in my mind that I did not do anything wrong. This was 100 percent an accident," he told The Associated Press in an exclusive interview.

Stewart added, "While much of the attention has been on me, it's important to remember a young man lost his life. Kevin Ward Jr.'s family and friends will always be in my thoughts and prayers."

He may not be completely out of the case, however. The family of the young driver hinted a civil lawsuit. According to Sporting News, they are questioning the decision of the Ontario County grand jury and the allegations that Ward was under the influence of marijuana when the accident happened.

Here is an excerpt of the open letter of his aunt, Wendi Ward published in USA Today:

"Why was the toxicology report even an issue? Seems to me the wrong man was on trial. Tell me why Tony Stewart was not taken in for testing, why his car wasn't impounded. Tell me how a man the size of Kevin can make a sprint car turn to the right on impact. Tell me how a lap before (the incident) everything was fine, but the following lap was poor lighting. Tell me how a NASCAR star totally forgot what caution means.

Maybe he should get a different headset so he is able to hear on the radio that the car in caution is up high, so go low. Or was he low until he rounded the corner and saw Kevin Jr. standing up for himself?

I guess we will never know why all of this was not taken into consideration. Or will we never know why a fellow driver did not check on this young man or his family? Or do we know why? I do, because I have seen the video. It's there, and it's real.

I can't speak for others. These are my opinions and concerns. I only hope some people take a minute to make sure they have done no wrong before throwing stones."