A young mother has become the second fatality in a fast-moving fire that consumed a condominium building in San Juan Capistrano, killing her son and injuring seven others. Maricela Sanchez, who turned 20 last week, was pronounced dead at 8:40 p.m. Wednesday at UC Irvine Medical Center in Orange, according to the Orange County coroner’s office. Sanchez’s 3-year-old son, Jaiden Liborio, died Tuesday night, hours after flames and smoke destroyed the building on La Zanja Street, displacing 80 residents.