A man has pleaded guilty to the murder of teenage Instagram star Bianca Devins after sharing gruesome images of her body online.

Brandon Clark, 21, from Cicero, New York, entered a plea of guilty for second-degree murder for the July killing of the 17-year-old social star, months after he plead not guilty.

On July 14, Mr Clark allegedly slit the throat of Devins in Utica, New York, before attempting to kill himself, police said.

He then posted bloody images of himself with Devins’ body on Discord, an online chat service, and his own Instagram page. One image showed Mr Clark with a self-inflicted cut on his own neck.

Friends and family said Mr Clark and Devins were not romantically involved, according to police, but the man got jealous after the pair attended a concert in New York City together on July 13. Devins kissed another man at the concert and it sparked a furious reaction from Mr Clark.

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He initially pleaded not guilty in connection to the murder and was set to go to trial later this month before changing his plea. In court, Mr Clark apologised for his actions. When speaking to the judge, Mr Clark said Devins “didn’t deserve what happened to her”.

“I think I need to realise what I did I can’t undo, as much as I want to,’’ he said. “I have to face it.”

The pictures Mr Clark shared of Ms Devins’ body on social media filtered across multiple platforms. While some companies removed the images, they still exist in other places of the Internet.

Ms Devins mother, Kim Devins, has since worked with politicians to advocate for social media reform, specifically as it relates to the posting of graphic images like the ones of her daughter.