The last episode of "Game of Thrones" season four will premiere on Sunday, June 15, and fans are speculating about what they should expect.

There are many potential spoilers online relating to George R.R. Martin's novels, but the show has been straying from following them to the letter. However, actress Lena Headey may have leaked two spoilers for this season. There also have been discussions about Tyrion Lannisters fate. Check out the potential spoilers below.

1. Lena Headey's possible Instagram spoiler 

Headey posted a photo herself posing with Pedro Pascal, the actor who played Oberyn Martell, month's before Tyrion Lannister's trial by combat. In the photo, Headey pretends to squeeze Pascal's eyes, which was a reference to Oberyn's death.

The actress has since posted a photo of a heart made of stones with the caption: "my stone heart." If you've read the books, the potential reference could mean the appearance of Lady Stoneheart. Lady Stoneheart is better known as zombie Catelyn Stark. Could it mean we will see Catelyn in the final episode of the series?

2. Tyrion's Fate

If you've read the novels, you know what happens to Tyrion at the end of his trial. You won't find any major spoilers here, but Tyrion lives. However, something absolutely terrible will happen to him, which causes him to flee King's Landing.

The incident involves his father Tywin Lannister and his lover Shae. Tyrion suffered a massive betrayal by Shae during his trial. Shae twisted Tyrion's words to get back at him for never loving her back and sending her away. In all fairness, Tyrion had every opportunity to leave Kings Landing with Shae, but he refused. It's unclear why Tyrion decided to stay, but his fate has been sealed by the Gods.

"Game of Thrones" will air on HBO this Sunday at 9 p.m. EST.