This weekend's death of an IndyCar Series team member who collapsed after a fight at an Indianapolis bar has been ruled a homicide, police said Monday.Police said David Evans, a 63-year-old British man who was an engine mechanic for Newman/Haas/Lanigan Racing, died of a stroke after someone struck him during a fight at Kazablanka bar at 5801 Rockville Road early Sunday.The county coroner's office determined that stress from the fight induced the stroke and ruled the death a homicide, Indianapolis police said. Police said they are investigating a person who fought with Evans and that the county prosecutor's office will decide whether to file charges.The team, which includes drivers Justin Wilson and Graham Rahal, intends to compete in this month's Indianapolis 500. Wilson and Rahal passed the Indianapolis 500 rookie orientation program on Sunday, hours after Evans died.Witnesses told police Evans and other team members were leaving the bar at about 1 a.m. Sunday to diffuse a fight that had started inside. But the argument continued outside, and a man struck Evans in the head, witnesses told police.Police were called, and officers found Evans unresponsive. Evans was taken to Wishard Memorial Hospital, where he was pronounced dead at 1:47 a.m., police said.Brian Lisles, general manager of the Chicago-based team, said Monday that being involved in a fight would have been highly uncharacteristic of Evans."One of the things that we grieve about most is not only losing Davey, but that his final moments on this world were totally atypical of how he led his life," Lisles said.