Joseph Marley, the eldest son of eight-time Grammy-winner Stephen Marley and second grandchild of reggae legend Bob Marley, has died at age 31. The Jamaican-American recording artist and DJ, known professionally as Jo Mersa, was found unresponsive in a vehicle on Tuesday, Dec. 27, according to Kingston, Jamaica-based journalist Abka Fitz-Henley, who was the first to report the news. A representative for Jo Mersa later confirmed the news to Rolling Stone. A cause of death has not been revealed, although South Florida radio station WZPP has reported that the artist died of an asthma attack. Joseph Marley was born on March 12, 1991, in Kingston, and the third-generation Marley grew up surrounded by music, performing onstage at age 4 with Ziggy Marley and the Melody Makers — his father, his uncle Ziggy, and his aunts Cedella and Sharon — during that group’s concert finales. He moved to Florida at age 11, where he studied studio engineering and observed his father and u...