The shooting happened in the area of Grogan and West Avenues on April 21.
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Merced police say 20-year-old Kaylie Lynn Allen was shot at least once. She was pronounced dead at the scene.
Authorities say that Jose Kevin Valencia-Zavala got upset and started fighting with others when he wasn't allowed inside the party.
Police say he left the area, came back and started shooting at people outside.
Valencia-Zavala was arrested on Thursday after being seen leaving a motel.
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He was booked into the Merced County Jail for murder.
Anyone with more information is asked to contact the Merced Police Department.
EDITOR'S NOTE: The video above is from a previous broadcast and will be updated.