Enrique Vicente Olivera fell onto the southbound lanes of the Palmetto Expressway near Bird Road before a truck hit him after midnight, police said.
"The driver of a Ford Ranger pickup truck struck what he thought was debris in the road," said Lt. Pat Santangelo, a Florida Highway Patrol spokesman. "He stopped and realized it was a body."
Authorities found a spray can with silver paint next to Olivera's lifeless body.
Santangelo said graffiti vandals are known to climb onto the traffic sign structure by making their way on catwalks that connect the signs to other more accessible parts of the roadway.
Photo by Freelancer Raul Torres
Miami's graffiti community is in mourning. For years Olivera's pseudonym was Merk.
MiamiGraffiti.com-- R.I.P MERK (Late 1998-99)