On February 24, 1944, he was flying his 51st mission escorting B-24 bombers that were carrying experimental "non-defusable" bombs when he disappeared. His wingman later stated that he could not remember if they were engaged by enemy aircraft or experienced flak. Luftwaffe records, however, state that the P-38 (42-67752) was shot down by Stabsfelwebel (Sergeant Major) Krausse of 4/JG 11 on this date.
In a letter to Tibbetts' aunt in 1949, a German priest named Heber Kosak stated that he watched an American aircraft get cut off by a German fighter. In the chase that followed, he said that the P-38 lost its tail rudder, a propeller, and then crashed on a farm near Sondra. Munitions on the plane exploded, and the aircraft took 2 days to completely burn.
Tibbett's body was hidden by the priest and some villagers until after the war, and his body was then reinterred at the G.A.R. Cemetery in Homer, Illinois. There is a memorial in Sondra, Germany at his crash site.
- Air Medal with 2 oak leaf clusters
- American Campaign Medal
- American Defense Medal
- Distinguished Flying Cross
- World War II Victory Medal
- European-African-Middle Eastern Campaign Medal with 2 bronze stars