CORSICANA (CBSDFW.COM) – A man shot and killed himself after shooting and killing his wife and sister-in-law Friday night in Corsicana said police.

Corsicana Police arrived to the 2100 block of Navarro Drive after a woman called claiming her sister and her sister’s husband were arguing outside in the back patio. The woman said the man had a gun.

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Nancy Castillo, 28, told 911 operators she was inside with her sister’s three children.

Castillo said she got the children through a window and outside of the house safely and then heard a gunshot soon after.

Police said they found Castillo lying on the front yard with gunshot wounds. According to police, an officer performed CPR but she was pronounced dead moments later.

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They also said they found suspect Rosalio Mendoza, 28, inside the house dead with what appeared a self-inflicted gunshot wound.

During the house search, police also found Mendoza’s wife, Vanessa, dead on the back patio with a gunshot wound.

Further investigation revealed Mendoza forced himself inside the home and later made his way to the bedroom where Castillo was attempting to escape out of a window. Police believe he shot her and then shot and killed himself as he was found dead in the same bedroom.

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Police are still investigating.