Iran Press/ America: He also shot a nine-year-old girl and wounded her mother in a nearby home, authorities have said.
The gunman identified as Keith Melvin Moses, 19, was arrested shortly after the shootings on Wednesday, said Orange County Sheriff John Mina.
Moses was also formally charged in connection with the killing of a woman in her 20s hours earlier, a shooting that the two journalists were covering when they came under fire, Mina said.
None of the victims, a reporter and a photographer for Spectrum News 13, was identified.
Mina said Moses was armed with a pistol when taken into custody.
He has a lengthy criminal record that included arrests on charges linked to firearms offenses aggravated battery, assault with a deadly weapon, burglary, and grand theft.
Mina said no motive had been determined but believed the gunman to have been an acquaintance of the first victim who was shot while sitting in a car with the gunman and another person.
The sheriff said the two newsmen became targets because they were journalists.
He said their vehicle did not have TV station markings typically seen on a news van.
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