Michelle Trachtenberg’s former co-star Rosie O’Donnell has paid an emotional tribute to the star following her shock death aged 39.

Trachtenberg was found ᴅᴇᴀᴅ 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 after battling alcohol issues and ‘may have been experiencing complications.’ 

O’Donnell, 62, who starred alongside child star Trachtenberg in Harriet The Spy in 1996, mourned the ‘heartbreaking’ loss of Trachtenberg in a statement to People.

She said: ‘I loved her very much. She struggled the last few years. I wish I could have helped.’ 

Trachtenberg’s spokesman told DailyMail.com: ‘It is with great sadness to confirm that Michelle Trachtenberg has pᴀssed away. The family requests privacy for their loss. There are no further details at this time.’

Michelle Trachtenberg’s former co-star Rosie O’Donnell has paid an emotional tribute to the star following her shock death aged 39 – pictured in 1996 film Harriet The Spy

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

Police said there is no foul play suspected in her death. 

‘On Wednesday, February 26, 2025, at approximately 0801 hours, police responded to a 911 call of an aided individual at 1 Columbus Place, within the confines of the Midtown North Precinct,’ police said in a statement.

‘Upon arrival, officers observed a 39-year-old female unconscious and unresponsive. EMS responded to the location and pronounced the victim deceased. 

‘Criminality is not suspected. The Medical Examiner will determine the cause of death. The investigation remains ongoing.’

Trachtenberg was best known for her work as Buffy’s (Sarah Michelle Gellar) younger sister Dawn Summers in 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 alongside Blake Lively spanning 2008-2012.

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

Her final outing was to Sartiano’s restaurant in SoHo last Thursday night. 

She said: ‘ I loved her very much. She struggled the last few years. I wish I could have helped’

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

Trachtenberg had previously sparked fears for her health last year 

An autopsy will be carried out by the medical examiner’s office to establish the exact cause of death.

In the wake of her death, her former Gossip Girl co-star Ed Westwick shared a poignant throwback of the star on the show, captioned: ‘So sad to hear of the pᴀssing of Michelle Trachtenberg, sending prayers.’ 

Her Harriet The Spy co-star Rosie O’Donnell mourned the ‘heartbreaking’ loss of Trachtenberg in a statement, adding: ‘I loved her very much. She struggled the last few years. I wish I could have helped.’

In 2023 Michelle reprised her role in two episodes of the second (and final) season of HBO Max’s Gossip Girl reboot.

The Brooklyn native also had a recurring role as ‘The Witch of the Upper East Side’ Georgina Sparks in 28 episodes of The CW teen soap Gossip Girl spanning 2008-2012

Trachtenberg was found ᴅᴇᴀᴅ Wednesday in her New York City apartment near Columbus Circle (pictured with medical examiner van outside) just after 8am local time 

Michelle is pictured with her mother Lana in 2007 – Lana discovered Michelle’s body on Wednesday

Trachtenberg’s former Gossip Girl costar Ed Westwick paid an emotional tribute

The star is pictured at Halloween with boyfriend Jay Cohen

Trachtenberg is pictured in Hollywood in 2020 

Trachtenberg was just 14 when she was cast on Buffy (pictured 2001 with Sarah Michelle Gellar) 

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

Trachtenberg shared this Instagram snap on February 12 captioned ‘eye of the tiger’

Her final Instagram post, uploaded seven days ago, was a throwback picture of her attending the Killing Kennedy premiere at the Saban Theatre on November 4, 2013

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.

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

Trachtenberg raised concerns among her fans after sharing 10 Instagram posts over the past three weeks ahead of her death.

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

Her final Instagram post, uploaded seven days ago, was a throwback picture of her attending the Killing Kennedy premiere at the Saban Theatre on November 4, 2013 in Beverly Hills.

‘I wanted to look like naughty #tinkerbelI wanted to look like naughty #tinkerbell,’ she captioned the picture, which showed her posing on the red carpet.

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.’

‘I wanted to look like naughty #tinkerbelI wanted to look like naughty #tinkerbell,’ she captioned the picture, which showed her posing on the red carpet.

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.

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.

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

Trachtenberg’s Eurotrip co-star Travis Wester (back right) shared an emotional tribute to the star

The former child star is pictured on the Buffy set in  2000 aged 14

Last month Trachtenberg hit out in response to an Instagram comment left by a teen fan about her former Gossip Girl co-star Lively. 

When Audrey Long, 18, left a comment on Michelle’s Instagram page about her former co-star Blake, she thought it was both innocent and complimentary – and she didn’t expect the response she’d receive in return. 

Blake is currently embroiled in a lawsuit against her former It Ends With Us co-star Justin Baldoni and is accusing him of using ‘abuser playbook’ in his $400 million lawsuit against her and husband Ryan Reynolds.

Audrey, who runs a Gossip Girl fan account that re-sells clothing featured on the hit 2000s TV show, has been supporting Blake amid the ongoing lawsuit. 

Audrey commented, ‘Would love to see you release a statement on the Blake drama,’ alongside a heart emoji. 

‘Or idk if this is a direct statement?’ she asked, referring to the post, which was a picture of Michelle captioned, ‘It takes a lot of strength to see through all the b*lls**t. And some dark sunglᴀsses.’ 

Last month Trachtenberg hit out in response to an Instagram comment left by a teen fan about her former Gossip Girl co-star Lively, both seen above together in 2009 

‘It takes a lot of strength to see through all the b*lls**t. And some dark sunglᴀsses,’ Michelle Trachtenberg commented the above Instagram post 

The Harriet the Spy alum responded, ‘gosh. Im busy worrying about real world news and families who have no home anymore from the LA fires. But you do you’ 

‘You’re so fabulous,’ Audrey continued in her comment. 

But the ex-child star quickly responded – and was not pleased with the question about her former co-star.

Read MoreBREAKING NEWS Michelle Trachtenberg tributes after death at 39

The Harriet the Spy alum wrote, ‘Gosh. I’m busy worrying about real world news and families who have no home anymore from the LA fires. But you do you,’ paired with an eye rolling emoji. 

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

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.’

‘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.’

‘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. 

The star also appeared in 2004 hit EuroTrip.

Her breakout role came as Georgina Sparks on  Gossip Girl before landing the part of Dawn Summers on Buffy.

The latter won her another Young Artist Award and three Saturn Award nominations.

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.