Kaitlin Hernandez was set to walk to the graduation stage this upcoming May but is now being mourned by her family.
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According to police, Hernandez's family said she and her neighbor went for a walk, but Hernandez never returned.
RELATED: Mother makes gruesome discovery after 16-year-old daughter allegedly murdered in their apartment
Later that evening, the teen's naked body was discovered underneath a bridge. Police said it appeared she was strangled.
"I'm begging you, please. Somebody knows something," the teen's mother tearfully pleaded to the cameras.
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13 UNSOLVED: Murder on Red Bluff Road
13 Unsolved: Murder on Red Bluff Road
Police said they did interview the neighbor the victim was last seen with, but no arrests have been made.
The family is expecting to hold a vigil in the teen's honor on Friday.