A lawyer for a racecar driver who was killed when he was run over by Tony Stewart's car says legal claims by the NASCAR star in response to a lawsuit are "appalling."

Attorney Mark Lanier said in an email Saturday that Kevin Ward Jr. was killed last year as he walked on a dirt track in upstate New York even though Stewart is one of the world's best drivers.

The lawyer noted five other cars drove around Ward during a yellow caution flag before Stewart "revved his engine and ran him over."

Ward's family sued Stewart this month, accusing Stewart of gross negligence in the August 2014 accident at Canandaigua Motorsports Park. Stewart's lawyer said in court papers Friday that Ward died because he exited his car during the race.