San Antonio Police Chief William McManus says a woman killed in a standoff on Monday night may have accidentallybeen shot by police. McManus said 28-year-old Angel Sanchez was armed and refusing to come out of a home on Roosevelt Avenue near VFW Avenue. He was reportedly threatening his common-law wife, 29-year-old Neida Tijerina. When he came out and aimed a shotgun at police, three officers shot him. Police found Tijerina shot dead afterward, and McManus says the officers may be to blame. Sanchez is in critical condition and charged with aggravated assault.