Besides being the role of female actress Juliette Lewis in the Oliver Stone film "Natural Born Killers" there is more than one artist with this name (see links in the Wiki sources):
These are photos from concerts where Mallory Knox played, so they may be of other bands that played the concert as well.
Warped Tour 2015 Jul 25, 2015 Tinley Park, Illinois, United States Uploaded by Dani Rae Carter
Warped Tour 2015 Jul 24, 2015 Auburn Hills, Michigan, United States Uploaded by Cardi
Vans Warped Tour 2015 Jul 10, 2015 Camden, New Jersey, United States Uploaded by Ashleyfrench