NewsgalleryMartha McLean's Grand Canyon trekBookmarkShareNewsByGavin Castle09:50, 17 SEP 2015Updated09:53, 17 SEP 2015Martha McLean to trek Grand Canyon for charity1 of 6Grand Canyon National Park2 of 6Martha McLean - with dog Mojo - to trek Grand Canyon for charity3 of 6Martha McLean with her grandmother Janina Cienicka4 of 6Canyon trekker Martha McLean with ehr children (L-R) Annie, Charlie and Ruby5 of 6Martha McLean - with dog Mojo - to trek Grand Canyon for charity6 of 6