A 32-year-old man has pleaded not guilty to charges of murdering four family members. Sergio Rivera-Vega is accused of igniting a house fire that killed his father, sister, nephew, and niece. The fire occurred on August 18 and the youngest victim was particularly young, though their exact age is not specified.

The case is ongoing and further details are available from the source. Rivera-Vega's plea was entered in court on Tuesday.

The incident is reported to have involved a house in Richmond, with the court proceedings taking place in Martinez, California.