Controversy is still swirling over the death of race car driver Kevin Ward Jr., who was fatally struck by three-time NASCAR champion Tony Stewart's car during a sprint race at the Canandaigua Motorsports Park in New York, on Saturday.

After Stewart knocked Ward's car off the dirt track and into a fence, Ward walked onto the track to confront Stewart, whose No. 14 car came back around, hit and dragged him about 50 feet. A video of the incident went viral over the weekend.

Police questioned Stewart on Saturday night and again on Sunday. Ontario County Sheriff Philip Povero says no charges have been filed yet, but is asking spectators to give authorities any photos and videos they shot of the crash.

According to CBS Tampa, Stewart threatened driver Matt Kenseth after a wreck in the Irwin Tools Night Race in August 2012. Stewart reportedly threw his helmet at Kenseth’s windshield.

“I checked up twice not to run over him," said Stewart, reported CBS News. "And I learned my lesson there, and I’m going to run over him every chance I got until the end of the year. Every chance I got."

It's not clear if Stewart meant he was going to physically run over Kenseth, or was using a racing expression.

Stewart was also involved in a July 2013 accident at the Canandaigua Motorsports Park with driver Alysha Ruggles, which left her with a fracture in her back.

While Stewart may not be charged with any crimes, Ward's family could file a wrongful death lawsuit against him.

According to Uproxx.com, Ward’s aunt recently slammed Stewart on Facebook:

I feel numb, I look into the eyes of family and see a deep hurt that should not be there, my heart has pounded out of my chest for hours, thanks for thinking of our family tony Stewart when you decided to be a dick! My nephew was one of a kind, a true race car driver, a piss head and a sweetie all in one, a young man who will be truly missed by many! Aunt Wendi loves you budster, forever in our hearts.

Sources: CBS Tampa, CBS News, Uproxx.com, Facebook (Image Credit: James)