Vikings season 6 spoilers: How will Lagertha die? Who will kill Lagertha?

VIKINGS season 6 is coming to screens this December. In the build-up, the official Vikings Instagram account has been teasing clips from the final series. Recently, 2 clips have been shared suggesting Lagertha’s life is in serious danger. So, how will Lagertha die and who will be the one to kill her?