What is wrong ? Big green plants wilted suddenly

[newgardener_tx]

Could somebody help me to identify the problem? I have a German Johnson with tomatoes on it already. One morning I saw two top tips were wilted, by the afternoon the whole plant was wilted. The leaves were still green. I didn't see any bugs. I pulled the plant (very reluctant and sad) and the roots looked ok. The first pic is the sick plant, Second is the pulled out, third one is the healthy Cherokee Purple growing next to the GJ. You can see the GJ on the back.