She was selling greens door-to-door in Gayathripuram Mysuru:  In a first-of-its-kind incident,  a 55-year-old woman was killed when stray horses attacked her at Gayathripuram 1st Stage here this morning. The deceased is Parvathamma, wife of late Koosaiah and a resident of Muneshwaranagar in Udayagiri. She leaves behind two sons and three daughters. According to the…