The incident began about 4:10 p.m. Saturday at the King Arthur Estates Mobile Home Park in the 100 block of Sir Bedivere Drive, according to Riverside police Officer Ryan Railsback.
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A woman was shot inside a home at the mobile park. She was taken to a local hospital where she later died.
Three children were safely removed from the home, but the suspect barricaded himself inside.
After an hours-long standoff, SWAT officers entered the home and found the man dead.
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Investigators are working to determine what led up to the deadly shooting.
City News Service contributed to this report.