The costume garnered a range of responses on twitter, but most were very angry.
The image was originally uploaded Friday to the Facebook page of Caitlin Cimeno, pictured in the middle, with the caption "Happy Halloween from Zimmerman & trayvon." It was tweeted on Sunday by @jamievandekamp.
The man dressed as Martin is William Filene, 25, of Cape Coral, Florida, the Smoking Gun reports.
22-year-old Greg Cimeno, also of Cape Coral, is dressed as George Zimmerman. He allegedly commented "anything for the laugh," after Cimeno posted the photograph to Facebook on Friday.