Losing his father Odin is often depicted as one of the most challenging things that Thor has to experience in either comics or movies.
For movies, audiences will recall that Odin, played by Anthony Hopkins, met his inevitable fate via old age in Thor: Ragnarok.
Odin's death is still attached to the pile of unfortunate circumstances that Thor is forced to mourn through over the course of one movie.
More recently, in the comics, Thor mourns again following the events of Thor #23 by Donny Cates and Nic Klein. Leading into the conclusion of the «God of Hammers» storyline, the spirit of Mjolnir is laying waste to the world around it and neither Thor nor even The Avengers are capable of stopping it.Read more on screenrant.com