It was the city's first homicide of 2009.
Detectives said a gunman opened fire on the siblings just after
12 noon Monday at the corners of First Ave. South and Goldwire St.
A 27-year-old suspect was arrested a few hours later.
Police said charges are pending.
Police identified the deceased man as 34-year-old Cornelius
The second victim was not named.
Authorities said the shooter was stabbed last week.
Detectives are trying to determine if Monday's shooting is connected to the stabbing.