The Dilgar were an aggressive feline-like humanoid species. They attempted to expand their territory by invading those sectors of space held by The League of Non Aligned Worlds between 2230 and 2232. 
As the Dilgar War broke out, the Earth Alliance fought on the side of the League and battled the Dilgar, forcing them back to their homeworld. After the war ended, the Dilgar sun went supernova, effectively wiping out the entire species. Only Deathwalker survived, having fled the Non Aligned sectors and sought shelter with the Wind Swords clan of the Minbari Warrior caste. She was eventually killed by the Vorlons in 2258, rendering the Dilgar extinct.
|The following is based on The Mongoose Publishing RPG books and contradicts canon sources.|
Mongoose Publishing produced a sourcebook called "The Galactic Guide" written by Ian Harac that puts details of some races wiped out by the Dilgar. Non-canon sources tell that among these were the Alacans, Mitoc and Krish.
|First Born Vorlon Shadow Walkers of Sigma-957 Thirdspace Aliens The Hand Asmodeus' race|
|Minbari Centauri Human Narn Dilgar Drakh|
|Drazi Brakiri Gaim pak'ma'ra Abbai Yolu Hyach/Hyach-do Markab Llort Grome Hurr Cascor Balosian Onteen Iksha Vree|