Bob Marley's Grandson Joseph Mersa Marley Dead At 31

Bob Marley's grandson, reggae artist Joseph 'Jo' Mersa Marley, has died.

Sources tell TMZ Joseph, known in the music world as Jo Mersa, passed away Tuesday due to asthma-related conditions ... although the specifics surrounding his death are unclear.

Joseph, son of Stephen Marley, took to Miami Dade College and studied audio engineering after spending his early years in Jamaica.

He went on to drop an EP in 2014 called "Comfortable" ... which held some tracks like "Rock and Swing" and "Bogus." He also released the hit single, "Burn It Down," in 2016 -- and put out a 2nd EP, "Eternal," last year.

He was only 31.