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SANFORD, Fla. GeorgeZimmermantestified that he was driving to a doctor's appointment when he noticed he was being pursued by a vehicle whose driver later pulled up, exchanged words and fired one gunshot at him that missed.

"I heard a bang and my ears started ringing,"Zimmerman, 32, told the jury in the attempted second-degree murder trial of Matthew Apperson, 37. The trial opened Tuesday in the Seminole County Courthouse.

The incident on May 11, 2015 was not the first encounter between Apperson andZimmerman, the former neighborhood watch volunteer who fatally shooting unarmed teenager Trayvon Martin in 2012. Apperson alleged in September 2014 thatZimmermanthreatened him in a road-rage encounter, but did not press charges at the time.

During the later exchange,Zimmermantestified that Apperson asked whether he remembered him and said he didn't press charges earlier "because I wanted to kill you myself."

Apperson's attorney, Michael LaFay, said thatZimmermanwas the aggressor and brandished a gun in both incidents, but prosecutor Stewart Stone said there was no way Apperson could have seen a gun through the tinted windows ofZimmerman'scar.

The trial was scheduled to continue Wednesday.

In the Martin case,Zimmermanclaimed self-defense and was acquitted of charges in the shooting, a verdict that sparked protests and a national debate about race relations. Martin was black andZimmermanidentifies as Hispanic.

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