(NEWSER)Â â€“ As of now, the Ontario County sheriff in upstate New York doesn't expect to file charges against NASCAR's Tony Stewart after heÂ struck and killedÂ a fellow driver at a dirt-track event Saturday night, reports the RochesterÂ Democrat and Chronicle. The investigation is continuing into the death of 20-year-old Kevin Ward, but the sheriff says he sees nothing to suggest that Stewart acted criminally. However, he's again asking that witnesses send in whatever photos and videos they have, reportsÂ the AP. Investigators also are reconstructing the accident, taking into account track conditions and the dim lighting. In the incident, Stewart sent Ward's car spinning into the wall, and Ward then walked onto the track to confront Stewart. Though one car swerved to avoid Ward, Stewart fishtailed into him. Ward's actions may sound nuts to non-racing fans, but as theÂ New York TimesÂ reports, it's not that uncommon.