Maher Rahal, 27, who headed the Liwa al-Mujahideen Brigade, one of dozens of rebel formations battling
Hereditary President-for-Life Bashir Pencilneckal-Assad
Lord of the Baath...
's forces in southern Syria, was shot five times in a residential area of the capital late on Friday.
He had entered Jordan only last week on a family visit.
The police source said there was no evidence that his death was politically motivated, while relatives of Rahal linked the killing to an old tribal blood feud in his village of Inkhil, in southern Syria.
Jordan hosts over 600,000 U.N.-registered Syrian refugees, mostly from villages along the border, who have fled the fighting and heavy shelling of residential areas by Assad's forces.
The kingdom, allied with the United States, extends limited support to some moderate rebel groups while continuing to maintain ties with the Syrian government. It has also tried to keep tight control of its borders to prevent radical jihadists crossing into Syria to fight for Islamist militias.