Kieth,
A third book I would recommend for general information on the Aleutian campaign is: Ralph Wetterhahn, The Last Fligth of Bomber 31: Harrowing Accounts of American and Japanese Pilots Who Fought in World War II's Arctic Air Campaign.
The author lists Kiska Katie as having been shot down on 15 May 1943 with a caveat that it could have been on 14 May. However, the B-24 that crashed on the 14th hit the side of a mountain in the clouds and apparently the entire crew was lost.
Doug Beckstead
Historian
Anchorage, Alaska