Blow flies (Diptera: Calliphoridae) comprises a forensic and medical importance group of flies, been the first to find and colonized human corps. Our interest is found out the time needed to reach the different stages of its life cycle: eggs, larvae, pupa and adult. By recognizing the time of development of the different immature stages, we can know the real time of development, to obtain more reliability when estimating the post-mortem interval (IPM), and been used as forensic indicator. The larvae were fed with three types of tissues, to observe in which one of them grew faster. The three types of tissues were meat of the head, liver and heart. These were served as food stratum for the larvae. Our results showed that the larvae grew faster in heart tissue, than in the liver and flesh, since the development to adult stages took less time, it means 96 to 194 hours or 4.o to 8.0 days.