Died that night.
Sorry about your loss .
I'm sure our pea health experts will advise you on this, but any other peas you have will need medication right away too.
Even if they look healthy - they often don't look sick until it is too late.
Sorry for your loss. Do you live in the US? If so, buy a bottle of Fish Zole (250mg metronidazole), a bottle of liquid Baytril (enrofloxacin) and a bottle of Safeguard for Goats (fenbendazole). Deworm all with the Safeguard at 0.23 ml per pound orally for 5 days. If more start to look sick, give one Fish Zole tablet orally once a day for five days and give Baytril 0.045 ml per pound orally twice a day for no more than 5 days. Also might be a good idea to get a tube and syringe to tube feed with.