Houston authorities discovered that Matthew Mitchell murdered his wife Thy and their two children in a house in River Oaks before dying by suicide.The couple, known as successful restaurateurs behind Traveler's Table and Traveler's Cart, were recently honored by the Texas Restaurant Association.Police are investigating the motive for the tragedy which has deeply shocked the community.The victims included eight-year-old Maya and four-year-old Max who were found alongside their parents during a welfare check.