Michelle Trachtenberg, known for her role in Gossip Girl, caused worry among her followers by posting 10 times on Instagram within the last three weeks before her passing at 39 years old.

Prior to her shock passing, the star was extremely active on social media. 

Her last Instagram update, shared a week ago, featured a throwback photo of her appearance at the Killing Kennedy premiere at the Saban Theatre in Beverly Hills on November 4, 2013.

Captioning the image of her posing on the red carpet, she wrote, ‘I wanted to look like naughty #tinkerbell.’

Days prior, she shared another older picture and joke about not letting the ‘Sunday scaries’ get to her. 

She was clearly in a nostalgic mood as she also recently shared a snap, taken in 2011 at the School of American Ballet Winter Ball, and a cheeky suggestion for those without Valentine’s Day plans to watch her true crime docuseries, Meet, Marry, Murder.

Gossip Girl star Michelle Trachtenberg raised concerns among her fans after sharing 10 Instagram posts over the past three weeks ahead of her death at age 39; seen in 2013

Additionally, she shared a sweet tribute to her boyfriend, talent agent Jay Cohen, who she described as ‘the man who sits still long enough for’ her to ‘paint his face.’ 

The post included a sweet snap of them from Halloween dressed as Dr. Jekyll and his alter ego, Mr. Edward Hyde. 

Although the comment sections on her post have since been flooded with condolences and ‘rest in peace’ messages, many expressed worry about her health ahead of her death.

On February 8 and February 12, Trachtenberg shared more recent selfies in the same location, which appeared to be taken on an outdoor patio.

On Wednesday, Trachtenberg’s rep confirmed her death in a statement.

‘It is with great sadness to confirm that Michelle Trachtenberg has passed away. The family requests privacy for their loss. There are no further details at this time,’ he said. 

Trachtenberg was found dead Wednesday in her New York City apartment near Columbus Circle just after 8am local time by her mother, police sources told ABC News. 

It was further reported the actress recently underwent a liver transplant and ‘may have been experiencing complications.’ 

Prior to her shock passing, the star was extremely active on social media

She was clearly in a nostalgic mood as she also recently shared a snap, taken in 2011 at the School of American Ballet Winter Ball (seen above)

As she wished her followers an ‘ethereal’ weekend, she reminisced on feeling like Cinderella at the event

Additionally, she shared a sweet tribute to her boyfriend, talent agent Jay Cohen, who she described as ‘the man who sits still long enough for’ her to ‘paint his face’

She is believed to have died of natural causes and police are not treating the death as suspicious, sources added to the New York Post.

Trachtenberg was best known for her work as Buffy’s (Sarah Michelle Gellar) younger sister Dawn Summers in 66 episodes of Buffy the Vampire Slayer from 2000-2003.

She also had a recurring role as ‘The Witch of the Upper East Side’ Georgina Sparks in Gossip Girl spanning 2008-2012.

In recent years Trachtenberg had sparked concern for her health after sharing troubling social media posts in which she looked frail.

In 2023 Michelle reprised her role as the wedding-spoiling, manipulative socialite in two episodes of the second (and final) season of HBO Max’s Gossip Girl reboot.

Trachtenberg’s last major gig was executive producing and hosting the 13-episode true-crime docuseries Meet, Marry, Murder for Tubi TV in 2021.

In 2018, she had voiceover gigs on her buddy Seth Green’s animated spoof Robot Chicken on Adult Swim as well as the Facebook Watch animated series Human Kind Of.

Last year the star hit back at ‘haters’ who expressed concern over her health and appearance.

Trachtenberg was found dead Wednesday in her New York City apartment near Columbus Circle just after 8am local time by her mother, police sources told ABC News; seen in 2023 

The former child star – who boasts 1.1M Instagram/Twitter followers – wrote’Fun fact. This is my face. Not malnutrition no problems. Why do you have [to] hate? Get a calendar.’

The drama began when Michelle shared a snap of herself about to get her hair done at Tracey Cunningham’s Mèche salon in Beverly Hills.

A fan asked: ‘Michelle [you] look sick. [Are you] ok?’

Trachtenberg replied: ‘@cathy_critz explain to me how I look sick. Did you lose a calendar and not realize I’m not 14? I’m 38. How sad for you to leave such a comment.’

The next day, she posted yet another selfie with the defiant caption: ‘I’ve received several comments recently about my appearance. I have never had plastic surgery. I am happy and healthy. Check yourself haters.’

It was further reported the actress recently underwent a liver transplant and ‘may have been experiencing complications’

Michelle uploaded two more selfies she took and, again, fans clarified they’re not worried about plastic surgery or malnutrition but rather her ‘thinning hair and yellow eyes.’

Buffy star Michelle Trachtenberg, 38, hits back at ‘haters’ over cruel comments about her ‘thinning hair’ and ‘yellow eyes’

‘Nobody is talking about plastic surgery. They are talking about your liver shutting down,’ one follower wrote.

Another typed: ‘I really don’t think anyone was implying you had plastic surgery. We are generally concerned about you. Your eyes are yellow, your hair is [thinning] majorly, you look sick.’

Her breakout role came as Georgina Sparks on Gossip Girl

Trachtenberg pictured with her former Gossip Girl costar Blake Lively

‘People are just worried that your eyes are yellow and all your hair is falling out,’ another penned.

‘I think they are worried for your health.’

One follower wrote: ‘Anyone with yellow eye balls is not well and needs to see a doctor.’

Trachtenberg began her acting career aged three on Nickelodeon television series The Adventures of Pete & Pete (1994–1996).

In 1997 aged 11 she won a Young Artist Awards for her performance as Maggie in CBS’ Meego.

Trachtenberg appeared in 66 episodes of Buffy The Vampire Slayer; seen in 2003

The star also appeared in 2004 hit EuroTrip and Buffy The Vampire Slayer, between  2000 and 2003, for which she won another Young Artist Award and three Saturn Award nominations.

Her breakout role came as Georgina Sparks on Gossip Girl.

Trachtenberg was nominated for a Daytime Emmy Award for her role as host of the Discovery Kids series Truth or Scare (2001–2003).

Her other screen credits include Mysterious Skin (2004) and Black Christmas (2006).

She also starred on the NBC television series Mercy (2009–2010) as Chloe Payne.