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California woman accused of killing her 18-year-old sister and 3-week-old niece out of "jealousy and sibling rivalry"

A California woman and her boyfriend were charged Monday with the murder of her 18-year-old sister and 3-week-old niece who were shot in their Fresno home out of jealousy and sibling rivalry in September, authorities said.

Yarelly Solorio-Rivera, 22, and Martin Arroyo-Morales, 26, were each charged with two counts of murder and a special circumstance of multiple murders in the Sept. 24 killings of Yanelly Solorio-Rivera and her baby, Celine, the Fresno County district attorney's office said in a statement.

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Booking photos of Yarelly Solorio-Rivera and Martin Arroyo-Morales. Fresno Police Department

Yarelly Solorio-Rivera also was charged with two enhancements of "personal and intentional discharge of a firearm causing death."

She and her boyfriend allegedly agreed to kill her sister and she fired a 9 mm handgun multiple times as her sister and niece slept, killing them both, prosecutors said.

It wasn't immediately known if Solorio-Rivera and Arroyo-Morales have retained attorneys who could speak on their behalf. They are scheduled to be arraigned Tuesday.

Fresno police arrested the couple last week and they are being held at the Fresno County Jail on a $2 million bond.

Fresno Police Chief Paco Balderrama said after the arrests that when officers arrived they found Yanelly Solorio-Rivera shot to death in her bed with her baby Celine in her arms. According to a Fresno Police Department press release, both were pronounced dead at the scene.

"We have the murder weapon — a Smith & Wesson 9 mm handgun — and we have a motive: jealousy and sibling rivalry," Balderrama said at a press conference.

Investigators were able to positively identify Arroyo-Morales in surveillance video that showed a man walking in the area around the home where Yanelly and Celine were killed, Balderrama said. Authorities had offered a $25,000 reward in the case.

Balderrama described Arroyo-Morales as a "verified gang member."

If convicted of all charges, they face life without the possibility of parole or the death penalty.

"The District Attorney's Office is currently conducting the necessary analysis on whether to seek the death penalty and will make an announcement on that decision at a later date," officials said.

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