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Prosecutors have rested their case in the trial of a middle-aged white Florida man charged with killing a black teenager after a dispute over loud music outside a convenience store.

Prosecutors called their final witness in direct testimony Monday — just a week after jury selection started in the murder trial of Michael Dunn, 47, a software engineer from Brevard County.

Dunn, who had a concealed weapons permit, is charged with first-degree murder. He has pleaded not guilty and claims he shot and killed Jordan Davis, 17, of Marietta, Ga., outside a Jacksonville store in self-defense.

A state forensic analyst testified earlier Monday that Dunn would have had to remove his gun from a holster and then load it just before the fatal shooting.

Testimony from Maria Pagan, who works for the Florida Department of Law Enforcement, supported prosecutors' contention that Dunn acted with premeditation on Nov. 23, 2012.

She testified Monday that Dunn would have had to put upwards of six pounds of pressure on the trigger to fire the gun into the Dodge Durango where Davis and three other friends were at the time of the incident.

Under questioning from prosecutor Angela Corey, Pagan said it would require a conscious effort to fire a gun like that.

The Associated Press contributed to this report.