Although the casting of Death has yet to confirmed, some fans have suggested that Cate Blanchett's character Hela — the Asgardian goddess of death in «Thor: Ragnarok» — will be the object of Thanos» affection; the alleged synopsis neither confirms nor denies the theory. (cbr.com)
Another fanciful villain that we'd love to see her play would be Hela, the Norse goddess of death who in the comics was appointed by Thor's father Odin to rule over the realm of the dead. (inverse.com)
In comic books — like most of the Black Order — Proxima Midnight is dead, having been killed by Hela, the Asgardian goddess of death (and the villain of Thor: Ragnarok). (newsarama.com)