Q.why did my peas die
Last summer I planted Lincoln pea seed. They had a fence to climb on and grew quite well. Then suddenly went downhill. The pea vines started to yellow from the bottom, and continued to the tip, till the whole vine was dead. Just wondering if it could be a nutrient problem or water problem. I know they weren’t too dry. They turned wilty yellow, then crispy brown like they had been burned, but the temps were not that hot.

Certified GKH Gardening Expert
It sounds like your plants got pea wilt. This article will have more information:
https://www.gardeningknowhow.com/edible/vegetables/peas/peas-wilting.htm