On Saturday, a 34-year-old man was killed in the parking lot of Memorial Park, according to the Upland Police Department. Investigators say the victim had been involved in a prior altercation with the suspect, Pete Renteria, who later returned to target the victim.
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Renteria was arrested shortly after that deadly shooting.
Investigators had been searching for the 29-year-old for months in connection to the deaths of three of his family members.
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Back in January, the victims - 68-year-old Sonia Ramirez, 66-year-old George Ramirez and 43-year-old David Ramirez - were all found shot to death in a home on Ramona Place in Ontario.
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Renteria, who is now in custody, had been identified as the primary suspect in the killings.
The victim in Saturday's incident has not been identified.