A father allegedly killed his two young sons to the witness of his estranged wife before taking his own life but sparing hers so she could suffer the loss of her children.

Police in South Florida say Victoria Flores Zavala, 36, was watching TV in her home around 1.50am this morning when she horrifyingly discovered her estranged husband, Isidro Zavala, choking one of her young boys with a rope.

The mother tried to fight off the man who no longer lived in the Boynton Beach home and begged him to kill her and spare their two boys aged 11 and 12 instead,