The musician, who recently posted photos on Instagram showing him performing with his young son, died in his hometown of Bogalusa, the source said in a statement.
“Javorius Scott died of his injuries” after the shooting, which took place shortly before 6 p.m., said the police who also mentioned his pseudonym JayDaYoungan.
A “close family member” who was also injured is in stable condition in hospital, the statement added without giving further details.
According to media, the second victim would be the father of the deceased rapper, who was 24 years old.
Police added that an investigation was ongoing and that they would release “further information” when it was “available”.
“23 Island” was released three years ago and has 173 million views on YouTube.