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Investigators worked through the night to piece together a portrait of a “gun fanatic” who armed himself with an assault rifle and unleashed a cocaine-fueled rampage Tuesday in an Azusa neighborhood, killing one man and critically wounding two women before being killed by police.

Residents in the quiet San Gabriel Valley neighborhood waited for hours to return to their homes and reunite with the families as investigators swarmed the area “to understand what happened,” Azusa police said.

Although the motive for the shooting remained under investigation, authorities said the gunman had been on a cocaine binge when he launched his attack.

On Wednesday morning, the Los Angeles County coroner’s office said investigators were still working to identify the 45-year-old gunman and notify his family.

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