jamal al-labani was a oakland , california , gas station owner , as well as a husband and a father-of-three .
al-labani traveled to yemen in an attempt to extricate his pregnant wife and daughter from the civil war there and fly them to california .
he was unable to because the us withdrew its diplomatic staff in february .
yemen also recently shut down most of its airports .
al-labani was struck by mortar shrapnel after leaving a mosque tuesday in aden and soon died .
al-labani 's cousin has said houthi forces launched the mortar shelling .
houthi forces have been battling to take aden , a last foothold of fighters loyal to saudi-backed president abd-rabbu mansour hadi .
the us state department has said ` there are no plans for a us government-coordinated evacuation of u.s. citizens at this time '