The murder took place on Monday in a bar in Rosarito, a city 16 km from the border town of Tijuana, Xinhua news agency cited a statement as saying.
The 33-year-old was an editor for the local channel CNR TV Noticias, and a reporter for a news website, the statement said.
A man, identified as Alfredo N., was arrested by police as he travelled in a taxi carrying a firearm.
According to police, Rivera was shot in the head. The suspect was arrested in the ongoing search.
A CNR TV Noticias report said Rivera had fallen victim to the climate of insecurity and "permanent instability" in Baja California.
The police have initiated an investigation into the incident.
Rivera is the eighth journalist killed in Mexico since March.
The Mexican government has vowed to improve protection for journalists in the country.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.