FSA Liwa Shuhada al Islam group (the Martyrs of Islam Brigade) in a statement has been declared Abu Jafar Al Hindi death.
Although the statement has not specifically said how he died but reports suggest he drowned in a river near Darkoush in a rebel held district of Idlib province.
The group mostly operated out of Darayya near Damascus before being evacuated to Idlib in September as part of a government deal.