Kevin Ward Jr. , a New York sprint car driver who was killed Saturday night after an on-track incident with NASCAR driver Tony Stewart , died of `` massive blunt trauma , '' authorities said Monday . Sheriff Philip C. Povero told reporters that the Ontario County medical examiner finished an autopsy on the 20-year-old driver on Monday . Povero also said investigators were reviewing a second video of the incident in which Stewart 's car struck Ward as the young driver stood on the dirt track after a spin out . Ward died of his injuries before an ambulance arrived at a hospital . The sheriff said the investigation was progressing well , but gave no timeline as to when it would wrap up . He reiterated that there was no evidence at this point that a crime has been committed . Investigators spoke to Stewart 's representatives on Monday , the sheriff said . Stewart was interviewed after the incident , authorities have said . On Saturday night , Ward 's sprint car hit the outside wall during lap 14 of a 25-lap race put on by the Empire Super Sprints series at the Canandaigua Motorsports Park in upstate New York . A video of the incident shows two cars coming out of a turn with Stewart 's No . 14 car sliding up the track toward Ward 's No . 13 car . The two cars get close and appear to make contact before Ward 's car hits the wall and spins out . Another car narrowly avoids hitting the 13 car as its sits on the track facing the wrong direction . Ward gets out of his crashed car and walks determinedly on the track toward the race cars , which had slowed for a yellow flag . Ward points a finger and appears to be yelling . One car swerves to avoid Ward on the half-mile dirt track . Stewart 's car passes close to Ward , and it appears that its right rear tire hits him . The second video was taken from a different angle , the sheriff said without elaborating . Ward 's funeral will be held Thursday , according to an update on the Empire Super Sprints website . `` The entire Ward family sends their sincere thanks to all that has send their heartfelt notes , calls , texts , anything that has been sent their way , '' the post says , adding the family is `` very proud of Kevin . '' Stewart express sadness . `` There are n't words to describe the sadness I feel about the accident that took the life of Kevin Ward Jr. , '' Stewart said Sunday , according to a written statement tweeted by NASCAR . `` It 's a very emotional time for all involved . ... My thoughts and prayers are with his family , friends and everyone affected by this tragedy . '' Stewart decided not to take part in Sunday 's NASCAR event at Watkins Glen , New York . Whether he competes in this weekend 's event is still undecided . `` The decision to compete in this weekend 's NASCAR Sprint Cup Series event at Michigan will be Tony 's , and he will have as much time as he needs to make that decision . It is still an emotional time for all involved , Tony included . He is grieving , and grief does n't have a timetable , '' spokesman Mike Arning said . Opinion : Why Tony Stewart is n't likely to face charges in racetrack death . Ward began racing at 4 . Ward , from Port Leyden , New York , was in his fifth season in the Empire Super Sprints series . He began racing when he was 4 , running go-kart events . A competitor who runs the car that swerved around Ward expressed sympathy . `` Our deepest condolences go to the entire Ward Family . We are one huge ESS family , you will be truly missed bud ! # RIP13 , '' Hebing Racing tweeted . Stewart is a three-time champion in NASCAR 's top division and won a sprint car championship in 1995 . He also owns a dirt race track in New Weston , Ohio , and has frequently raced sprint cars , even during the NASCAR season . He broke a leg last year in a sprint car crash that ended his racing season . He has raced the full NASCAR season this year but only returned to sprint cars in July . In 2013 : Injuries as debris flies into Daytona stands during fiery NASCAR crash . Jason Leffler , accomplished race car driver , dies in dirt-track accident .
Investigators are looking at a second video recorded Saturday night , sheriff says . Medical examiner releases only cause of death , no further details . Comment: Kevin Ward Jr. died from injuries after Stewart hit him during a caution lap .