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PLANO -- Police found a 28-year-old woman and her four-year-old son shot dead Friday when they responded to a welfare concern in Plano.

Lydia Soto and the boy were found around 10:25 a.m. at a home in the 6200 block of Windhaven Parkway.

A release from the Plano police department said the preliminary investigation indicates a murder-suicide, but the official cause of death will be determined by the Collin County Medical Examiner's Office.

Her son's name has not been released.

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