General Zod
TGT Addict
It wasn't attached, but while on a photo shoot an XB-70 and an F-104 collided. The F-104 flipped into the XB-70 after getting into its vortex and both aircraft went down in the Mojave not too far from Barstow. I've ridden past/through the crash site on my dirt bike... there are a surprising number of crash sites out there being so close to Edwards AFB (which is named after Capt G. Edwards, who died in a XB-49 crash, the site of which I have also ridden through)
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Here's a pretty decent overview of the crash. While this video doesn't offer explanations, I've read in multiple accounts that it was because the F-104 strayed into the Valkyrie's wingtip vortex as you mentioned. Some say the pilot of the 104 had trouble judging his distance because of the sheer size of the XB-70.