MIAMI -- The Florida Highway Patrol said a man who was hit and killed by a truck on an expressway might have fallen from an overhead sign he was tagging.

The 28-year-old man fell from a catwalk on a road sign hanging over the Palmetto Expressway at about 1 a.m. Friday.

Troopers said a pickup truck hit and killed the man on the roadway. The driver of the pickup truck did stop.

FHP troopers found a can of spray paint near the man's body. The man's identity has not yet been released.

Several signs on Interstate 95 in Miami were vandalized earlier this week; officials say they don't know if the man who fell scrawled the graffiti on the other signs.

Although the Florida Department of Transportation tried to clean off the graffiti, it did not work. FDOT must replace two express lane signs at a cost of $46,000.