The jurors and alternates selected to hear the trial of the man accused of killing Trayvon Martin will be sequestered, a judge ruled Thursday afternoon.

Judge Debra Nelson announced during the jury selection that the jurors will be sequestered for George Zimmerman's second-degree murder trial, which is expected to last two to four weeks.

During the first four days of jury selection, lawyers had been asking potential jurors whether being sequestered would be a hardship on them. Most said they could serve on the jury but cited family, work and school responsibilities as concerns.

Zimmerman is pleading not guilty to second-degree murder. He claims he shot Trayvon Martin, 17, in self-defense.