New York ? Rihanna is mourning the death of her cousin and calling for an end to gun violence. The singer posted photos of herself with 21-year-old Tavon Kaiseen Alleyne on Instagram on Tuesday, writing that she "can't believe it was just last night that I held you in my arms!" She also wrote, "Never thought that would be the last time I felt the warmth in your body!!! Love you always man! In the video he says, "It's nice to wake up and see all of your brothers and sisters."