The boyfriend of a 17-year-old social media star is accused of slitting her throat, posting a grisly picture of her dead body on Instagram and then trying to kill himself.

Brandon Andrew Clark, 21, of Cicero in upstate New York is said to have written he was 'sorry' on a picture of Bianca Devins' remains.

Her body was found outside her car in Utica on Sunday morning after people started sharing the grisly post on social media.

Internet star Bianca - who had 35,000 followers across two Instagram pages - is thought to have argued with Clark after the pair went to a concert in Queens.

The disturbing picture of her dead body is then said to have been online for more than 12 hours behind a sensitive image filter until Instagram removed it.

Brandon Andrew Clark, 21, of Cicero, is accused of killing Bianca Devins, pictured, before inflicting severe injuries to himself in upstate New York

Police named Clark - thought to be a frequent user of the dark web site 4chan - as a person of interest in the death and say he is currently hospitalized

Utica police told BuzzFeed News Clark keep posting to Instagram Stories while he was being held at gunpoint by officers.

A spokesman for Instagram told DailyMail.com: 'We removed this image, and subsequently the account, for violating our policies.

'To stop the content from spreading, we have technology that allows us to proactively find other attempts to upload the image in question, and automatically remove these posts before anyone sees them.

'We are also reviewing hashtags and accounts claiming to share this content and taking action in line with our policies.'

Police named Clark - thought to be a frequent user of websites 4chan and Discord - as a person of interest in the death and say he is currently hospitalized. The New York Post reports he called 911 to report the incident himself.

A woman thought to be Bianca's sister, Liv Devins, called Clark a 'close family friend who we trusted so much'.

The blogger’s sister Liv Devins paid tribute to her sister, center, with this image

A disturbing image is said to have been shared of Bianca showing her dead. The picture is said to have been online for more than 12 hours until Instagram removed it

Police confirmed Monday they received a number of calls 'regarding an attempt to locate' two people.

The couple - thought to have been dating for around two months - are said to have got into an argument at the show before driving to Utica.

Instagram said it removed an account registered to Clark with the handle @yesjuliet after the image was posted.

He is thought to have uploaded the image of the victim's lifeless body there with the caption: 'I am sorry Bianca.'

Clark is also reported to have changed his bio for his Instagram account to: '10/06/1997 – 7/14/19. Just know that I feel no pain now.'

He is later thought to have posted a Instagram story with the caption: 'Here comes Hell. It's redemption, right?'

And police believe Clark left a message on the ground with spray paint which read: 'May you never forget me.'

He then tried to take his own life by slitting his own throat, according to reports, but is now in hospital.

Lt. Bryan Coromato said in a statement: 'The female is outside the vehicle, and the male was located outside the vehicle. At this point what occurred and when it occurred is part of the investigation.'

He said the murder weapon appears to be 'a sharp instrument'.

Brandon Andrew Clark, 21, of Cicero, is said to have then written he was 'sorry' after Bianca Devins was found dead outside her car in Utica on Sunday morning. Utica police told BuzzFeed News Clark posted to Instagram Stories even as he was being held at gunpoint by officers

Clark is reported to have changed his the bio for his Instagram account to: '10/06/1997 – 7/14/19. Just know that I feel no pain now.' He is also thought to have posted a Instagram story with the caption: 'Here comes Hell. It's redemption, right?'

The blogger’s sister Liv paid tribute to her sister, writing: 'I hate that I have to write this. I hate knowing you’re not going to ever come back home.

‘You were the best sister anyone could’ve ever asked for. Thank you for always being there for me. ‘Thank you for being the best sister I could ever imagine.

‘Thank you for always protecting me and sticking up for me. ‘I am going to do this for you. ‘Every day I’m going to do my best and I’m going to get through this thing called life and do it all for you. Rest easy, I love you so much forever and always.’

Brandon Andrew Clark known as @yesjuliet on Instagram had his page disabled

Police believe Clark left this message on the ground, according to local reports

A man with the user name @jamesward2017, who claimed to be Clarke's brother, posted to Instagram to say he and his family had been targeted in the wake of Bianca's death.

He said: 'Shoutout to all the people who target someone’s family and blame them for a persons decisions.

'Nothing better than waking up at 4am to find out your brother killed someone and tried to kill himself, and when you’re trying to understand and comprehend how the person you looked up to, and taught you so much is responsible for such a horrible act, and people proceed to go out and blame you for what he did.

'So here I am stationed in Alaska for military service wanting nothing more than to wake up and be back home hoping this is some sick twisted nightmare, instead I’m all the way across the country.

'I’m deeply sorry something like this came from my family and my heart goes out for the family of the victim, but think about when his little sister and brothers find out what a disgusting thing he’s done, and get blamed for it. They’re kids.'

Twitter users criticized social media sites including Instagram for not taking the content down for hours