Not sure why this is just getting reported now, but Robert Murdock, curator of contemporary and 20th-century art at the Dallas Museum of Art in the 1970s, died October 1 in New York, of complications from cancer. With all the justified hullabaloo surrounding this week’s opening of the AT&T Performing Arts Center, it’s worth taking a moment to remember one of the people who helped solidify the Arts District’s place here.