Authorities reported to a home at 11 a.m. and found Martha Socorro Marin with a small puncture wound in the upper chest, KTLA-TV, Los Angeles, reported.
Marin was unconscious and authorities transferred her to UCI Medical Center, where she later died.
KTLA-TV said a 34-year-old man at the home told officers he accidentally shot Marin.
Britney Spears on kissing Ryan Gosling, Justin Timberlake in the Mickey Mouse Club
Exploding whale video goes viral on Internet