A 65-year-old who said both George Zimmerman and Trayvon Martin were at fault in Martin's fatal shooting was among four potential jurors interviewed by attorneys during the first day of Zimmerman's trial on second-degree murder charges in central Florida.

George Zimmerman listens to co-counsel Don West, on the first day of his trial in Seminole circuit court (Joe Burbank - Pool/Getty Images)

Jury selection continues today as prosecuting and defense attorneys question dozens of potential jurors, a process that's expected to take all week, if not longer.

Zimmerman is pleading not guilty to a charge that could carry a life sentence if convicted. He claims he shot the 17-year-old Martin in self-defense.

Judge Debra Nelson has said she'll keep the identities of selected jurors anonymous but rejected a defense request to sequester the initial jury pool of 500 residents.