NFL's Will Smith -- Shooter Charged with 2nd Degree Murder

12:34 PM PT -- Hayes has pled NOT GUILTY to all of the charges.

The man who shot and killed ex-NFL lineman Will Smith has been charged with 2nd degree murder ... and now faces life in prison if convicted.

The shooter -- Cardell Hayes -- has admitted to shooting Smith during the April 9th incident in New Orleans ... but has said he felt his life was in danger after a road rage argument because Smith was going to get his gun.

Prosecutors sent the case to a grand jury to determine whether there was enough evidence to charge Hayes ... and now we've learned the jury has given the green light.

According to officials, Hayes was indicted for 2nd degree murder, attempted 2nd degree murder (for Smith's wife), aggravated assault with a firearm and aggravated criminal damage to a vehicle.

Hayes was inside the courtroom as the indictment was presented to the judge.

As a result of the indictment, Hayes' bond was raised to $1.75 MILLION. He is still being held behind bars.