MARTINEZ — A 49-year-old Richmond man is facing a possible death sentence after being convicted in the shotgun killing of his ex-girlfriend while she was at work at a San Francisco Bay Area bridge toll plaza.

The Contra Costa Times reports ( ) jurors on Wednesday found Nathan Burris guilty of two counts of capital murder.

Burris was convicted of killing 51-year-old Deborah Ross in a toll booth at the Richmond-San Rafael Bridge in August 2009.

He was also found guilty in the killing of Ross' friend, 58-year-old Ersie Everette III, a bus driver for Golden Gate Transit District.

Prosecutors say Burris shot Ross and Everette because he thought they had become romantically involved after Ross ended a 14-year relationship with Burris.

Jurors on Thursday will return to the courtroom for the penalty phase of the case, where they'll deliberate on whether they'll recommend the death penalty for Burris.