A grand jury will decide whether NASCAR driver Tony Stewart will be charged in the August death of Kevin Ward Jr., a fellow driver at a sprint car race in upstate New York, a prosecutor said Tuesday.

Ontario County District Attorney Michael Tantillo said he made the decision to present the case to a grand jury after reviewing evidence collected by county sheriff's investigators.

Tantillo could have determined there was not enough evidence to support charges and dropped the case, but instead announced his decision more than a month after Stewart's car struck and killed Ward at a dirt-track race on Aug. 9.

A grand jury will decide whether to charge Tony Stewart in the death of Kevin Ward Jr. AP Photo/John Bazemore

In a statement, Stewart said he respects the time and effort authorities have spent "investigating this tragic accident."

"I look forward to this process being completed, and I will continue to provide my full cooperation," he said.

Stewart spent three weeks in seclusion before returning for the final two races of the Sprint Cup season. He did not make the Chase for the Sprint Cup championship field, and finished 18th in the first Chase race Sunday at Chicagoland.

Stewart still will compete in this weekend's Sprint Cup race at New Hampshire Motor Speedway, Stewart-Haas Racing said.

Ontario County Sheriff Philip Povero spent weeks investigating the accident at the small track in Canandaigua, several times saying investigators did not have any evidence to support criminal intent by Stewart. Ward had spun while racing alongside Stewart and then the 20-year-old climbed out of his car and walked down the track, waving his arms in an apparent attempt to confront the 43-year-old NASCAR veteran.

"Upon my review of all of the information contained in the entire investigation," Tantillo said, "I have made the determination that it would be appropriate to submit the evidence to the grand jury for their determination as to what action should be taken in this matter."

He said the law prevented him from saying when the case would be scheduled or who would be called as witnesses.

The sheriff asked in the days after Ward's death for spectators to turn over photos and videos of the crash as investigators worked to reconstruct the accident. Among the things being looked at were the dim lighting, how muddy it was and whether Ward's dark firesuit played a role in his death, given the conditions.

After Ward's death, NASCAR announced a rule that prohibits drivers from climbing out of a crashed or disabled vehicle -- unless it is on fire -- until safety personnel arrive.

Stewart, who has 48 career Cup wins in 542 starts, is one of the biggest stars in the garage. From the small town of Columbus, Indiana, he has long been one of the most proficient drivers in racing, winning in every kind of series, from sprint cars to the elite Sprint Cup Series. He has for years taken part in little races in nondescript towns because he loves the thrill of the high horsepower, lightweight cars skidding around the dirt.

He rarely made his schedule public, popping up when he pleased, and he was welcome at the clay track at Canandaigua Motorsports Park the night before the NASCAR race in nearby Watkins Glen. Instead, tragedy struck.

NASCAR spokesman Brett Jewkes said the series was closely following the case.

"We are aware of the completed investigation and the announced next steps," he said. "We will monitor this process and stay in close contact with Stewart-Haas Racing. It would be inappropriate for NASCAR to comment on this case so we will continue to respect the process and authorities involved."

The Associated Press contributed to this report.