M87 HAS BEEN ESTABLISHED AS A GAMMA-RAY SOURCE FROM THE GEV TO TEV ENERGY BANDS. THE SHORT VARIABILITY TIMESCALE AND MULTIWAVELENGTH CORRELATIONS HAVE SUGGESTED THAT THE GAMMA-RAYS MAY COME FROM NEAR THE EVENT HORIZON OF THE CENTRAL SUPERMASSIVE BLACK HOLE. THIE WILL BE A COMPREHENSIVE STUDY TO DETERMINE THE ORIGINS OF THE HIGH ENERGY GAMMA-RAYS IN M87. STATE-OF-ART RADIATION GRMHD SIMULATIONS WILL BE USED TO OBTAIN A DETAILED PICTURE OF THE PHOTON DISTRIBUTION NEAR THE HORIZON AND MEASURE ITS DEPENDENCE ON ACCRETION RATE MAGNETIZATION AND ELECTRON TEMPERATURE. THEN THIS INFORMATION WILL BE USED IN A SELF-CONSISTENT GR PIC SIMULATION TO STUDY THE MECHANISM OF PARTICLE ACCELERATION AND WILL OBTAIN A FULL GAMMA-RAY SPECTRUM FROM GEV TO TEV THAT CAN BE DIRECTLY COMPARED TO OBSERVATIONAL DATA FROM FERMI HESS MAGIC AND VERITAS.