There was probably an official search period and an extended unofficial search period. So maybe technically no one was killed during the official search period, but some lost their live in the unofficial search for him that stretch on after the official search ended.
Doing a quick search
” Army Pfc. Morris L. Walker
Remember Our Heroes
Army Pfc. Morris L. Walker, 23, of Chapel Hill, N.C.
Pfc. Walker was assigned to the 1st Battalion, 501st Parachute Infantry Regiment, 4th Airborne Brigade Combat Team, 25th Infantry Division, Fort Richardson, Alaska; died Aug. 18, 2009 in Paktika Province, Afghanistan, of wounds sustained when an improvised explosive device detonated near his vehicle. Also killed was Staff Sgt. Clayton P. Bowen.
WCHL 1360 — Twenty-three year-old Morris Walker, a UNC graduate who had joined the army this past spring, has been killed in Afghanistan.
Barbara Lambert works as the director of admissions at Fayetteville Academy, in Fayetteville, North Carolina, where Walker attended grades 6 through 12.
Walker’s sister sent out an email notifying those who knew him that he had been killed when an Improvised Explosive Device (IED) hit his convoy.
Walker graduated UNC in May 2008 and signed up for the army April of this year. Lambert says she believes Walker had plans to attend law school.
Before deploying to Afghanistan, Walker was stationed at Ft. Benning, Georgia and Alaska. Lambert says Walker’s mother had been in poor health when she got the news of her son’s death.
Lambert says Walker will be remembered for being genuinely well-liked and always having a smile on his face.
Funeral arrangements, as of Wednesday afternoon, had not been made yet.
Army Pfc. Morris L. Walker was killed in action on 8/18/09.”
http://livinglegendteam.blogspot.com/2009/08/army-pfc-morris-l-walker.html