First picture: some deficiency, perhaps of Sulfur and Magnesium; or the beginning of intoxication by the saliva injections from potatoe leaf hoppers.
Second picture: Rapid death from root rot or from Southern Bacterial Wilt. The first is usually from flooding or overwatering, especially in soil high in compost or other organic matter, or other slow-draining issue. The second is usually in soil contaminated by diseased tomatoes, or tomato relatives; this bacteria can survive in soil for over 7 years. Looks hopeless, but if sap is still rising in the plant, a drench with Alliette or Flanker may save the plant. As these products are poisonous, don't eat any fruit or other produce grown in that spot, for at least a year. Best to use that space for above ground container production.
Fourth and fifth pictures: Different issue, not sure. Perhaps a toxicity.