I think they've had one like this before. Apparently the BRITE radar feed doesn't show the southern part of their airspace. VFR separation isn't provided by ATC in Class D so you need to see and avoid, probably more so as it's busy airspace, but ATC having radar coverage is always nice. It's easy to get complacent when you think ATC are watching you on the scopes, but it's not a guaranteed service and you need to look after yourself.
Here is the report of that accident
http://ntsb.gov/ntsb/brief.asp?ev_id...08X09195&key=1