He is said to have been walking near his home in Lakes Close, Eden Lodge, St Michael at around 7pm when he was approached by a man who shot him multiple times and fled the scene.
He was rushed to hospital in a private vehicle but later died.
The eight-time Grammy award-winning singer paid tribute to Alleyne on Instagram. She posted a series of photos of her cousin while calling for an end to gun crime in the country.
“RIP cousin… can’t believe it was just last night that I held you in my arms! never thought that would be the last time I felt the warmth in your body!!!” Rihanna captioned a slideshow of pics of the two together. “Love you always man! 😢🙏🏿❤#endgunviolence.”
Police are currently on the hunt for the shooter and have asked anyone with information to contact Crime Stoppers Barbados or the District A Police Station.
Gun crime is said to have been rife in Barbados recently with police confirming a significant increase.