Yellowstone fans were left in shock after another major character was killed off on Sunday night in a huge plot twist.

Viewers immediately took to social media to share reactions to the bombshell episode, which was hailed as 'insane', 'incredible' and 'amazing.'

Following the shock death of Kevin Costner's iconic lead character John Dutton, Sarah Atwood, played by Dawn Olivieri, also met a grisly end in the final moments of season five, episode 11.

Sarah Atwood was killed by two assassins from the company she hired to kill Dutton, while she was on the phone with Jamie, which had fans simply flabbergasted. 

Her death came after Kayce Dutton (Luke Grimes) met with the medical examiner and made enough observations to convince her John Dutton's death was not a suicide, and actually a homicide. 

After the cause of death was changed from a suicide to a homicide, Sarah desperately tried to get in touch with the company she hired to kill John Dutton, even getting a burner phone to contact them.

However when she tried calling them, the number was out of service, when Jamie Dutton (Wes Bentley) returned home

The two argued about how the murder investigation will make things more complicated, with Jamie ultimately slapping Sarah, leading to her leaving.

Jamie was quick to call and apologize, but during the call, a car pulled up to Sarah, with a couple asking for her help. 

They asked directions to a place Sarah hadn't heard of, but then the man asked if she was Sarah Atwood, which took her by surprise.

When she was starting to ask how he'd know her name, he quickly pulled a gun and killed her while she was on the phone with Jamie.

The assassin fired a few more shots into her chest to confirm the kill, before picking up his discarded shells and speeding off without a trace as Jamie was still on the line, screaming as loud as he could.

The actress broke her silence after being killed off - and what's next. 

Fans quickly took to social media to express their shock at this killing, taking most of them by surprise though some fans were almost expecting it. 

@BaldBandit43 shared a GIF of Jon Stewart eating popcorn adding, 'Watching the end of Yellowstone.' 

@TheTVEscape shared a shocked cat GIF adding, 'WHOA! I did not see that coming!!!!' 

@IrvinML added, 'Damn!!! Yellowstone really picked up tonight,' hinting at frustrations with the first few episodes that many other fans had.

@BenDiesel24 added, 'I've gotta give Yellowstone some credit. This season is getting good. Given the circumstances and the messiness of it all, they have done as good of a job as they can in the aftermath.'

@mike_vaden16203 said, 'Yellowstone is amazing!!!' while @dhookstead said, 'That was an incredible episode of Yellowstone. Wow. What an insane ending!'

Others shared that they were glad the conniving Sarah Atwood was killed, like @elrezy_ who said, 'Sarah Atwood got what she deserved.' 

@Stratus2224 added, 'I couldn't stand her anyway,' while @fangirlfornfl said, 'MY JAW IS ON THE FLOOR.'

@TheTVEscape quote-retweeted @Stratus2224 adding, 'All of us right now!!!'

Other fans were convinced that Sarah would die, albeit in a more explosive manner like a car bomb.

@cmitc410 said, 'Car didn't explode but it was closest to it,' while @TiffSmallwood said, 'Oh f**k. I was not expecting that.' 

@W1LSON_101 added, 'Holy s**t,' an expletive phrase many used to discuss the shocking death on social media. 

Others were simply thrilled that the wicked character was killed off like @KDanielsen10 who said, 'YES!!!!!!!!! Bye Sarah!'

@Holz02WS6 said, 'OMG YES!!!! BYE B***H' while @ilovefroggie said, 'Yes! Finally!' referring to Sarah's demise. 

@Smokyy34 said, 'That was a satisfying ending,' while @JustinPearson5 said, 'Oh my gosh what an ending.'

@kleintime99 said, 'Didn't see that coming,' while @MsKatie80 added 'WHOA!!!! I didn't see that coming.' 

With the shady company now potentially exposed, it remains to be seen who they may go after next to try and clean up this mess. 

Since Jamie was on the phone with her when she died, it's possible they may try to take out the Attorney General next. 

Kayce revealed that he knew where the gun used to commit the murder was supposed to be, requesting that footage be pulled up.

Whether or not these black ops soldiers will be revealed remains to be seen with just three episodes remaining in the series.

Yellowstone returns Sunday, December 1, followed by the penultimate episode Sunday, December 8 and the series finale Sunday, December 15 on Paramount Network.