AGT star Nightbirde revealed life was "pretty brutal" in her final post before her death at 31 years old.

The inspirational singer and Golden Buzzer winner on the competition series passed away on Sunday after a long cancer battle.

In a post on January 11, Nightbirde, born Jane Marczewski, shared what became her last selfie on social media before her death.

She gave a soft smile to the camera, alongside a heartfelt message to her followers on how she was feeling.

She wrote: "Honestly, things have been pretty brutal.

"But this is a photo of myself from last week where I felt pretty, and alive, and awake, and human, and real."

The performer concluded: "I needed that. We’re all a little lost and it’s alright."

Her post was inundated with comments from friends and fans, with AGT judge Howie Mandel writing: "We’re all here trying to send positive energy your way."

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"You are a beautiful person with strength beyond words! Stay strong," another fan said.

One follower wrote: "You radiate more sparkles than anyone I have ever seen. Prayers and Hugs to you."

Nightbirde was battling Stage 4 breast cancer and her health in recent months had taken a turn for the worse.

A source told told TMZ that she had lost her fight with the disease on Sunday after months of treatment.

Following the tragic news Howie Mandel said that the singer "was such a bright inspirational light in all our lives. we must continue to live and learn from her words and lyrics.

"As much as I feel horribly about her passing I feel lucky to to have met, heard and known her."

The social media sensation's death came as a shock to fans after the singer shared an inspirational photo in December saying it was a "miracle" to "even be alive."

The AGT star shared a black and white photo of herself in her post, captioning it: "We are breaking records every second we survive."

She concluded: "How rare a miracle it is to even be alive."

'A TURN FOR THE WORSE'

Nightbirde opened up about her diagnosis during her memorable audition on the NBC show.

Her incredible performance moved Simon Cowell who issued her the Golden Buzzer, giving her a ticket straight to the live shows.

Due to her declining health, she unfortunately had to step down from the AGT finals, revealing the difficult decision in an Instagram post.

"Sharing my heart with the world on AGT has been an honor and a dream come true. My point of view this summer has been astounding.

"What a miracle that the pain I’ve walked through can be reworked into beauty that makes people all over the world open their eyes wider."

She continued: "Since my audition, my health has taken a turn for the worse and the fight with cancer is demanding all of my energy and attention.

"I am so sad to announce that I won’t be able to continue forward on this season of AGT. Life doesn’t always give breaks to those that deserve it—but we knew that already."

Nightbirde concluded: "Thank you for all your support, it means the world to me. Stay with me, I’ll be better soon. I’m planning my future, not my legacy. Pretty beat up, but I’ve still got dreams."

The singer would then reflect on her experience while starring in the talent competition, saying: "It’s so hard for me to not be on the @agt stage for the finals this week.

"I bet you never saw someone win so hard and lose so hard at the same time. This isn’t how the story was supposed to go."

'PAIN OF GIVING UP'

Fans have been following the star's story since her departure from the show as she continued to give updates on her health.

While speaking to former host Chris Cuomo in November, Nightbirde opened up about the "pain of giving up."

She said: "I did get a scan result back and a bunch of stuff that was there has now disappeared, and a bunch of the really big stuff has gone down in size. We're on the way.

"It's a lot to process the highest highs and the lowest lows of my life all happening at the same time, and all of this playing out in front of millions of people is really – it's a lot to carry.

"But it's also such an honor because the whole world is carrying their own weight, and we get to learn how to do this together."

When Cuomo mentioned if she felt "comfortable to dream," Nightbirde opened up: "I think life sometimes is a game of 'choose your pain' so the pain of continuing or the pain of giving up.

"So, the pain of continuing there is a lot more uncertainty that way, but I think the pain of giving up is so much worse."