This image provided by Logan Messerly shows ambulances on the scene at Canandaigua Motorsports Park on Saturday Aug. 9, 2014 in Canandaigua, N.Y. Authorities are investigating a serious crash that injured one person at a New York dirt track where Tony Stewart was racing on the eve of a NASCAR race. (AP Photo/Logan Messerly)
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Sheriff: 'There's much work to be done'
Ontario County Sheriff Philip C. Povero says there is a lot of work to be done in the Tony Stewart crash investigation.
4:10 • Source: CNN
Tony Stewart hits, kills another racer 9 videos
This image provided by Logan Messerly shows ambulances on the scene at Canandaigua Motorsports Park on Saturday Aug. 9, 2014 in Canandaigua, N.Y. Authorities are investigating a serious crash that injured one person at a New York dirt track where Tony Stewart was racing on the eve of a NASCAR race. (AP Photo/Logan Messerly)
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Sheriff: 'There's much work to be done'
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Grand jury: No charges for Tony Stewart
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Stewart sits in his car during practice for the NASCAR Sprint Cup Series Camping World RV Sales 301 at New Hampshire Motor Speedway on July 12, 2013 in Loudon, New Hampshire.
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Caption:WATKINS GLEN, NY - AUGUST 08: Tony Stewart, driver of the #14 Rush Truck Centers/Mobil 1 Chevrolet, sits in his car during practice for the NASCAR Sprint Cup Series Cheez-It 355 at Watkins Glen International on August 8, 2014 in Watkins Glen, New York. (Photo by Jerry Markland/Getty Images)
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NASCAR's Tony Stewart hits, kills driver
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