Deputies responded shortly after 7:30 p.m. to the 23800 block of Elyce Court, where one man was pronounced dead at the scene, according to the Riverside County Sheriff's Department. His identity was not immediately released.
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Three other men were transported to a hospital "for treatment of life-threatening injuries," a sheriff's news release said Sunday morning. "Early findings would indicate drugs are a factor in the death and we do not suspect foul play."
News video from the scene showed paramedics loading patients into ambulances at the end of a cul-de-sac lined by single-story homes.
The substance involved was unknown, authorities said in a previous statement.
The sheriff's Overdose Death Investigations and Narcotics Unit assumed the investigation.
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Anyone with information about the incident is urged to call sheriff's Master Investigator Cornett at (951) 955-1700.