Who killed Hela in Ragnarok?

Who killed Hela in Ragnarok? Eventually, however, Thor then returned with the newly formed Revengers and then reengaged Hela, which had then resulted with Loki unleashing Surtur, who then destroyed Asgard by finally causing Ragnarök and killed Hela as a result.

Eventually, however, Thor then returned with the newly formed Revengers and then reengaged Hela, which had then resulted with Loki unleashing Surtur, who then destroyed Asgard by finally causing Ragnarök and killed Hela as a result.