Thor knew that Loki was alive and on Earth not because of Heimdall… because of Frigga. In the comics version of The Movie Thor (2011), it is noted that Frigga communicated with Loki and warned Odin & Thor that the God of Mischief is alive and well. Hope this helps.
True to his word, Thor tells Odin that his brother died honorably, not realizing that he was talking to Loki the whole time. Thor returns to Asgard in Ragnarok to find that his brother is actually very much alive.
When asked about the possibility of Loki and Thor reuniting on the big screen in a possible future MCU film, Wright admitted that it is a possibility. He explained, "I think the sun shining on Loki and Thor once again has always been the priority of the story we're telling.
Odin probably just told Thor in between the events of Thor and The Avengers. It seemed like it was kept a secret more for Loki's sake than anyone, so once he found out it wasn't really a secret anymore. By the time of Thor: Ragnarok it appears to be public knowledge.
From his first MCU appearance in 2011's Thor, Loki revealed his ability to create duplicates of himself and fake his death. At the end of the film, Loki was seen careening through space to his apparent death, only to resurface during the end credits scene.
Loki has always delighted in cheating death, manipulating others into believing he was dead in order to hatch his next scheme. At the end of Thor, he apparently took his own life — but Loki survived death by plunging into one of the many portals he knew could be found in Yggdrasil.
In Thor: The Dark World, the God of Mischief joined Thor in battle against the Dark Elves, apparently redeeming himself, but died when he was stabbed in the chest. Thor grieved the loss of his brother, but viewers soon learned he had not really died at all.
By the jötunn Angrboða, Loki is the father of Hel, the wolf Fenrir, and the world serpent Jörmungandr. In the form of a mare, Loki was impregnated by the stallion Svaðilfari and gave birth to the eight-legged horse Sleipnir.
“What am I?” Odin explained that ages ago, he fought and defeated Laufey (Colm Feore), King of the Frost Giants. That's where he found the child Loki, who, abandoned and left for dead, was taken to Asgard and raised as Odin's son in the hopes that he would one day unite the Frost Giants and the Asgardians.
The actor returned in Ant-Man and the Wasp: Quantumania (in theaters now) not as his Loki character, He Who Remains, but finally as the villainous Kang the Conqueror... only for Scott Lang (Paul Rudd) and Hope van Dyne (Evangeline Lilly) to seemingly kill him off by the end of the movie.
Chris Hemsworth and Marvel are currently engaged in discussions about the potential development of 'Thor 5.' While the MCU has not officially given the green light for Thor 5, talks are ongoing with both Chris Hemsworth and Marvel. Insider DanielRPK has revealed that development for Thor 5 commenced in October 2023.
The potential reunion between Thor and Loki may occur in future MCU crossovers like Avengers: The Kang Dynasty and Avengers: Secret Wars as part of the Multiverse Saga. The sun may shine on them again.
During the events of Ragnarok, which led to the ultimate destruction of the cosmos, Loki, along with all the gods and goddesses, met his final end. His demise came in a battle with the Aesir god Heimdall, the guardian of Asgard, in which they fought each other to the death.
"Loki Is About 16 Years Old In The MCU In Thor: The Dark World, Odin reminds Loki that Asgardians are not immortal and have lifespans as humans do, to which Loki responds: "Give or take 5,000 years." From this, it can be calculated that Asgardians live to about 5,100, with Loki being around 1050 years old in the MCU."
While the original Loki was killed during the events of Avengers: Infinity War, a new version was reborn thanks to the Avengers' time-traveling five years later. As a part of the Time Heist, several Avengers travel from 2023 back to 2012, where they attempt to obtain the Tesseract from the Battle of New York.
Most Marvel fans think that Odin favors Thor over Loki because the former is his natural son, while Loki is the adopted son of the giant Laufey. However, there is another, much deeper reason for Odin's favoritism, and it hides in the one-eyed god's past and his relationship with his brother Cul, the God of Fear.
The majority of storylines surrounding Loki in the Marvel Cinematic Universe had to do with his father issues. He was always insecure over how Odin didn't love him as much as he did Thor, with this eventually morphing into contempt for his father.
Oddly enough, it was here when Odin chose to forgive him when he saw Loki before his death. At this point, Odin even praised Loki for using an effective enchantment on him. Odin didn't bring up any of the bad blood between them from Thor: The Dark World, nor did he have any anger toward Loki.
Loki shapeshifted and turned himself into an alluring female horse to draw Svaðilfari away from helping the master builder complete Asgard's fortifications. When they were together, Loki and Svaðilfari mated. Loki subsequently became pregnant and gave birth to Sleipnir.
Some sources characterize Loki as the son of two giants, who abandoned him in battle with Odin, one of the leading gods in Norse mythology. Other sources indicate that Odin and Loki became blood brothers and undertook adventures with Thor, who also figures prominently in the Marvel Cinematic Universe.
But by sacrificing himself to help Loki and Lady Loki, Classic Loki proves himself wrong. He's not selfish like the other Loki variants. He does have a glorious purpose, and it's giving up his life to help others. He laughs because of the absurdity of it all.
Like in all comics (and even films) Loki didn't stay dead. But, the fact Thor broke his father's rule to kill his brother emphasizes just how powerful the moment was. Thor killed Loki because he had no other choice - he couldn't sit by as his brother killed innocent bystanders (and people Eric deeply cared about).
However, Loki loved his mother, Frigga, who showed more affection to him. Sadly, both Odin and Frigga died in the original timeline. Loki felt angry and heartbroken after learning Algrim killed his mother. Also, the original Loki briefly reconciled with Odin before he died of old age.
