Instagram star Bianca Devin is reported to have been murdered at her home in Utica, upstate New York, on Sunday (Pictures: Instagram/Julia Le Blanc/Twitter)

A killer decapitated a popular Instagrammer he said was his girlfriend then shared photos of her dismembered corpse, it was claimed.

Brandon Clark, 21, is accused of killing 17 year-old Bianca Devins, at her home in Utica, upstate New York, on Sunday.

Bianca was a popular Instagrammer, who amassed over 35,000 followers across two profiles, the most popular of which was @escty. She was also an active and prolific user of the 4Chan image sharing site.

After killing her Clark, described by police as a ‘person of interest’ in the case, reportedly said to have then shared images of Devin’s body on his Instagram page with the caption ‘I’m sorry Bianca.’ Police say they have authenticated images of Bianca’s remains, but not a video purporting to show her murdered body.

Clark is also said to have changed his biographical information on the social media site, to read ’10/06/1997 – 7/14/19′, it is claimed.

Another Instagram story he appears to have posted was taken from a car driving down a darkened road, with the caption: ‘Here comes Hell.

Bianca’s sister Liv, far left, pictured with their mother, shared a tribute to her late sibling on Instagram after her horrific death (Picture: Liv Devins/Instagram)

‘It’s redemption, right?’

That appears to be a reference to the alleged murderer’s unsuccessful bid to kill himself after allegedly murdering Devin.

LocalSyr reported police arrived on the scene to discover a Clark , who they said was suicidal, standing next to an SUV.

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He reportedly told them that he had killed his girlfriend, and that he wanted to harm himself with a knife.

Police were able to talk Clark, and he was taken to hospital. He is now in police custody.

They found the woman’s body moments later.

Bianca’s killer is said to have shared this post on his Instagram page while en route to kill her

Police say they suspect Brandon Clark, pictured, of murdering Bianca (Picture: Instagram)

Bianca’s fans have disputed the alleged killer’s claim he was her boyfriend, and questioned whether he had ever met her before Sunday’s murder.

The blogger’s sister Liv Devins confirmed her sibling’s death with a touching Instagram post.

It read: ‘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.

Horrific photos showing Bianca’s mutilated body are said to be circulating online (Picture: Instagram)

‘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.’

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A candlelit vigil in memory of Bianca is set to take place in Utica on Monday evening.

Metro US has contacted Utica Police Department for further information.