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Thursday December 30 7:13 AM ET

Child-Killing Suspect Under Suicide Watch

(RICHARDSON) -- A "well-regarded" second-grade teacher from Richardson is now under a suicide watch at a local jail after being charged with strangling her two young sons. The boys were visiting Lisa Marie Smith for Christmas, but their father had won custody of them in a divorce. Police say the 31-year-old Smith told them she killed the three-year-old and five-year-old Sunday night after they opened Christmas gifts. Authorities say she tried to kill herself with gas Tuesday morning, but a fire started and brought fire crews rushing to the house, where the bodies of the boys were discovered.