"One wonders who will be next," the eulogy said. "And more importantly, who will be responsible for the blood of those brothers?"
Hammami, whose nom de guerre was Abu Mansoor Al-Amriki, or "the American," was reported killed in southern Somalia after months on the run after falling out with al-Shabab's top leader. The extremist from Alabama had been reported dead before, only to resurface. Al-Shabab rebels said on Thursday that Hammami was slain in an ambush but presented no proof of his death.
In an interview last week with Voice of America, Hammami said he had left al-Shabab and acknowledged he was being hunted down by his former allies within the rebel group. "I haven't been part of al-Shabab for quite a while now," he said.
In that interview Hammami accused al-Shabab's leader, Mukhtar Abu Zubeyr, of violating the principles of Islam and of trying to kill him. Asked if he would consider returning to the U.S., the militant said that was "not an option unless it's in a body bag."
In the past year Hammami had been critical of al-Shabab's leadership and freely shared his views in Internet videos and on Twitter, making him a marked man. The first serious attempt on his life came in April, when Abu Zubeyr also known as Godane ordered the killings of several of Hammami's associates.
Hammami, an Arabic speaker, moved from Alabama to Somalia and joined the al-Qaida-linked al-Shabab rebel group in about 2006. He fought alongside al-Shabab until they had a falling out amid increasing tension between Somali and foreign fighters. He first expressed fear for his life in a March 2012 web video that publicized his rift with al-Shabab.
Hammami was one of the two most notorious Americans in jihadi groups. The FBI put Hammami on its Most Wanted Terrorist list in 2012 and in March offered a $5 million reward for information leading to his capture. U.S. prosecutors had charged Hammami with providing material support to terrorists.
Hammami grew up in Daphne, Alabama, a community of 20,000 outside Mobile, the son of a Christian mother and a Syrian-born Muslim father.