MCSO description of missing 13-year-old Mariposa County juvenile—TCSO photo
Mariposa, CA – The Mariposa County Sheriff’s Office is turning to the public to help find a missing Mariposa County juvenile.
The picture in the image box is of 13-year-old Briella “Luna” Guerriera. Sheriff’s officials report that she was last seen at her residence in Lush Meadows in the Mariposa area on Sunday, February 2, 2026, between 9:30 pm and Monday, February 1, 2026, at 6:15 am.
“Briella left on foot, headed to an unknown location,” according to sheriff’s officials. “Briella was last seen wearing pajamas and maybe carrying a black backpack. Briella goes by the name Luna.”
Sheriff’s detectives describe Guerriera as a white female, 5’03” tall and weighing 96 pounds, with a thin build. She has brown hair and blue eyes. Anyone with information regarding her whereabouts is asked to call the sheriff’s office at (209) 966-3615.
Written by Tracey Petersen.
Sign up for our Breaking News Alerts and the myMotherLode.com Daily Newsletters by clicking here. Report breaking news, traffic or weather to our News Hotline (209) 532-6397. Send Mother Lode News Story photos to news@clarkebroadcasting.com.
For local news delivered to your email daily, sign up myMotherLode’s FREE Daily Newsletter here.