NEW ORLEANS - A car crash expert has told a jury in New Orleans he believes a driver intentionally crashed his Hummer into the vehicle driven by ex-football star Will Smith on the night of April 9.

That crash led to a heated argument and gunfire that killed Smith that night. The Hummer driver, Cardell Hayes, is on trial for second-degree murder.

New Orleans media accounts of Friday's testimony from expert Michael Sunseri say he put the blame squarely on Hayes. The defense challenged Sunseri's conclusions as they discussed "black box" data from the Hummer and Smith's Mercedes SUV.

Defense attorney Jay Daniels suggested Hayes may not have been paying attention and hit Smith's vehicle by accident.

It was the fifth day of Hayes' trial, which is expected to last into next week.