Absolutely right Wayne, and an excellent book it is too. I found this post on the Twelve O' Clock High Forum (2005) where the author John Manhro replies to a question about this event from forum owner Ruy Horta..
"First of all I do not know the name of the US soldier that actually shot Uffz. Maxis. I have been in contact with soldiers of the same unit, but they did not want to give me the name...... At least two years ago the specific US soldier was still alive. All documents I saw of the unit showed that there was no court martial. Uffz. Maxis was shot in the head from close range. To be honest, I did not really pursue the quest for the name of the soldier. My interest was mainly to find a possible grave. As a US Graves Registration Unit had taken the body I have checked all burial files of former US War cemeteries as Henri-Chappelle (Germans were buried there too!) and the ones in eastern France. I checked probably around 20,000 graves......no trace of an unknown German pilot that could be a match....."