That's sad. If you want to start a new tamagotchi press the A and C buttons together and an egg will appear. It will hatch after a few minutes. You can name it the same name as the tamagotchi that died and the tamagotchi that died will be in your history list.
You might want to post a topic in the Tamagotchi Memorial section of TamaTalk to honor this tamagotchi.
GotchiGirl96