Yup, 'Jane the Virgin' just killed [spoiler]! Who did it?

Spoilers for Friday's episode of Jane the VirginTo be fair, Narrator did warn us.
A few episodes ago, Narrator told us that this season one of six characters (Rafael, Petra, Luisa, Alba, Anezka, or Magda) would die. It's the oldest trick in the book, after all.
Well friends, Friday's episode ended with Petra discovering her evil(ish) twin sister Anezka, dead, hanging from the ceiling, and a tease from Narrator: She didn't kill herself.
Gasp!
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