Authorities in Texas say a teenage boy fatally shot his father during an argument over a fast food order, then killed himself.

Galveston County sheriff's officials say the violence occurred Sunday at the family home southeast of Houston.

Sixteen-year-old Robert Lee Mueller Jr. had returned home with the wrong food order for his father, 59-year-old Robert Lee Mueller.

Both died late Tuesday after nearly two days in a Houston hospital. The father was shot once in the head. The boy shot himself after police arrived.