UPDATED 12:03 p.m.
The drivers of both cars that collided head on at 6:44 a.m. on Lewiston Road, just south of Galloway Road, Batavia, were pronounced dead at the scene.
Investigators said the cars appeared to hit squarely, though the speeds of either vehicle have not yet been determined.
It's unknown what caused a northbound white sedan to cross the double-yellow line.
The sedan hit a minivan.
The sedan, a 1997 Buick, was driven by Quayeshawn D. Smith, 25, of 4590 Mill St., Medina.
The minivan, a 2002 Mazda, was driven by Rosemary Calla, 74, of 34 S. Main St., Oakfield.
Sgt. James Meier said he doesn't believe weather conditions, light wind and a light drizzle, contributed to the accident.
No other passengers were in either vehicle.
Town of Batavia Fire Department and Mercy EMS responded to the scene, though Mercy medics went back in service shortly after arriving at the accident.
Lewiston Road was closed in both directions between Galloway Road and Veterans Memorial Drive from shortly after 7 a.m. until 9:36 a.m.
Oakfield Fire provided traffic control at Galloway and Route 63.
The accident is being investigated by the Crash Management Team of the Sheriff's Office, which includes Sgt. Meier, Sgt. Bill Scott, Deputy Brad Mazur and Investigator William Ferrando.