A fourth day of jury selection in the murder trial of the man accused of shooting and killing Brevard County Deputy Barbara Pill nearly two years ago continued Thursday.

Brandon Bradley faces a potential death sentence if convicted in the 2012 shooting of Brevard County Deputy Barbara Pill.

The court has a large jury pool of more than 100 possible jurors. It helps by having more choices. Picking a dozen of them who could sentence someone to death is a tough endeavor.

"At that point, if you have no doubt a person committed first degree murder, would it be a fair statement to make that at that point the only sentence that would be appropriate would be the death penalty?" said Mike Pirolo, one of Bradley's public defenders, as he questioned a potential juror in court Friday.

So far more than 20 potential jurors have passed through to the next round.

"With a death case you have guilty or not guilty, and then, death or not death, with the sentencing phase, the second phase in the event of a conviction," said News 13 legal analyst Mark NeJame. "If they say they can't do that, then they can't sit on the jury."

Bradley faces the death penalty for the 2012 murder of Brevard Sheriff's deputy Barbara Pill.

A key witness will be his ex-girlfriend, Andria Kerchner, who was in the car when investigators say he shot the deputy during a traffic stop.

"Will the jury believe her?" NeJame said. "She's not going in there with a great deal of credibility, she was a cohort in this, and her actions helped cause the death of a wonderful police officer."

But NeJame said by the state offering Kerchner a plea deal, they can focus their case on Bradley.