photo by Will van OverbeekThird-generation Tex-Mex legend Matt Martinez, Jr. died last Friday at the age of 63. With his family, he owned Matt's Rancho Martinez and Matt's No Place restaurants in Dallas. He also had an interest in Matt's El Rancho, the legendary Austin Tex-Mex restaurant founded by his father in 1952. His grandfather, Delphino Martinez, immigrated from Mexico and made enough money selling tamales on Congress Avenue to open El Original, one of Austin's first Tex-Mex restaurants,