Who Killed Thor's Mom?

During the Dark Elves' raid on Asgard, Frigga is killed by Algrim while protecting Jane Foster, and is later given a Viking funeral. Frigga appears in an alternate timeline in Avengers: Endgame. In an alternate 2013, Thor runs into Frigga in Asgard, who realizes her son has come from the future.

Who killed Thor's mum?

Frigga, Thor's kind and powerful mother, dies at the hands of Malekith the Dark Elf midway through The Dark World, and there's no “Friggasleep” to help her heal.

Who killed Loki and Thor's mom?

This led to Malekith finding Frigga, Loki's adoptive mother and the Queen of Asgard. Kurse held her as the elf inquired about Jane Foster and the Aether, and when she didn't comply, Kurse stabbed and killed her.