One question for a translation!

Hi there!
I've got only one question.
Maybe it doesn't really fit in here.
I'm watching an anime and
now I want you to translate me something:

"A letter from the afterlife"

I heard out in the anime she said something like:

"shiko no sekai gara no tegami"

But I'm not really sure if it's correct especially the spelling!
Maybe you can say if that's right
or wrong? And can you correct it if it's not right and write that in Hiragana, Katakana or Kanji?

Would be deeply grateful!

I am going to guess that probably what you heard was

shigo no sekai kara no tegami

死後の世界からの手紙

Shi is death. Go is after. Kara is from. Tegami is letter.

Any other questions I can try to help you with?

No. I haven't got any other question.
And thank you, thank you so much!
I'm deeply grateful!