Rihanna added the hashtag #endgunviolence to an emotional post on Instagram.
“RIP cousin . . . can’t believe it was just last night that I held you in my arms!” she wrote.
The message was put up with a photo gallery dedicated to her cousin.
Rihanna didn’t name him, but the victim of the shooting was 21-year-old Tavon Kaiseen Alleyne.
She went on to write: “Never thought that would be the last time I felt the warmth in your body!!!
“Love you always man.”
She also tagged his profile in the series of photos.
In February he posted a heartfelt message under a photo of the two of them together celebrating the singer’s 29th birthday.
“Your presence in my life is a source of joy and happiness,” he wrote.
It’s believed Tavon was walking through a track by his house in St Michael when he was approached by a man who shot him multiple times before fleeing the scene.
Police are currently on the hunt for the shooter and have asked anyone with information to contact Crime Stoppers or the District ‘A’ Police Station.
Gun crime has been rife here recently with police confirming a significant increase, with 22 out of 28 murders committed this year being gun-related.