OMG. I'm so sorry. :(
Where did you get him from? Doesn't seem like you've had him very long... does the store have a policy on that? As awful as it sounds, I know some places you can take the dead fish back if it died within a certain time period and they will give you a new one...
Bettas: "Ammo," lavender/cellophane SDeT male
and "Emo," black & white marble DeT male
... also two dogs, one cat, and one husband ;)