Just before 1 a.m. on Tuesday, crews responded to a reported shooting where three victims were found, according to the Los Angeles Fire Department.
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One victim was in grave condition and later died. Two victims are in stable condition. All three were transported to a hospital, according to the Los Angeles Police Department.
A fourth person suffered a wrist injury while fleeing the scene, fire officials said.
The Los Angeles Police Department showed up at the mansion gates earlier on Monday evening but the huge party just kept on going.
A helicopter over the scene found several hundred people and several dozen cars in the long driveway.
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There was a food truck in the driveway and a DJ by the swimming pool.
The LAPD told the ABC affiliate in Los Angeles there was nothing they could do earlier because the partygoers weren't breaking any laws, and they're not enforcing health code violations.
No additional information was immediately available.