Bob Marley's grandson's death reason revealed

It is officially out. 

Bob's grandson Jo Mersa Marley died six months back.

He died at the age of 31.

He was the son of Stephen Marley. 

He died of acute asthma exacerbation.

This news is as per documents from Miami-Dade medical examiner's office. 

His manner of death is stated as natural.

The documents also stated that he was found unresponsive in his car. 

He was announced dead after the first responder attempted to perform CPR.