The modification of jet shapes in Pb-Pb collisions, relative to those in p p collisions, is studied for jets associated with an isolated photon. The data were collected with the CMS detector at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Jet shapes are constructed from charged particles with track transverse momenta (pT) above 1 GeV/c in annuli around the axes of jets with ... 30 GeV / c associated with an isolated photon with ... 60 GeV/c. The jet shape distributions are consistent between peripheral Pb-Pb and p p collisions, but are modified for more central Pb-Pb collisions. In these central Pb-Pb events, a larger fraction of the jet momentum is observed at larger distances from the jet axis compared to p p , reflecting the interaction between the partonic medium created in heavy ion collisions and the traversing partons.(ProQuest: ... denotes formulae omitted.)