Living about 20 miles from Tampa, I recall when this hit the news locally. I certainly have no proof, but it seemed to me at the time that the police (City of Tampa or Hillsborough County, not sure which one) just sort of shrugged their shoulders to the murder. 'Might have been an attempted robbery, who knows' kind of attitude. When his name came up, the news would be sure to point out his stupid money hustles that got him in trouble (running a gambling parlor, his arrest for going to cash in on the popularity of ecstasy by dealing that drug, his upcoming sentencing on a health care fraud case). The message was clear: he was not someone you should feel bad about.
Again, I'm speculating here, but it sure seemed as though the cops were not interested in putting forth any effort in the case due to Caldwell's previous arrests; it was just another criminal-on-criminal crime, and they couldn't be bothered. If it had been a squeaky clean famous person without those arrests, I'm sure the investigation would have been much more intense.