If you pull off the pin marked Return Value on the Spawn Sound 2D and create a variable from it. That will be setting a reference. You can use that reference to feed into a Fade or a Stop, which will either fade out the sound and stop it, or just outright stop it.
Realize though that if you are doing in player character and the player character will be destroyed depending on your death logic method, you may have to place to Stop or Fade for your sound elsewhere. There are other places you could do both the sound spawn and the Stop or Fade that might be intact longer. For example, PlayerController, GameMode or any logical place that won’t be destroyed with your player character while you respawn it. If your player character is not actually going to be destroyed and respawned, then it’s fine to do both the sound spawn and the fade or stop there.