A 14-year-old pregnant girl has been found buried under her boyfriend's porch.

Chiara Paez seemed like your average teenage girl.

She was sweet, close to her family, adored by her friends, and — if her social media accounts are anything to go by — happy.

She frequently posted Facebook statuses and Instagram posts with loving messages to her school friends and relatives, and had been dating a boy, Manuel Mansilla, for two months.

But on May 12, she went missing from her home in the early hours of the morning.

After a three-day search including family, friends and members of the public, Chiara’s body was found under her boyfriend’s back porch.

Manuel had buried his 14-year-old girlfriend — and she was still alive when he did.

The results of a recently-released coroner’s report revealed Chiara was eight weeks pregnant at the time of her death.

There were traces of an abortion drug in her body, leading authorities to believe that Chiara’s murder followed an argument about her pregnancy.

Related content: Girl buried alive by family makes miraculous escape.

But, her cause of death was not suffocation from the burial, or an adverse reaction to her drugging – the coroner found that she died as a result of a vicious beating. Although Chiara was still alive when she was buried, she had already suffered multiple blows to the head face and body.

Huffington Post reports, Manuel, 16, confessed to the killing and has been charged with aggravated assault, homicide and forced abortion.

Believing he couldn’t have acted alone, police are now investigating the possible involvement of Manuel’s mother and her partner.

Chiara’s tragic murder has spurred nationwide protests against “femicide” — the killing of a woman because of her gender.

Marches were organised across Argentina in response to a spate of intimate partner killings.

Men and women marched under the war cry “Ni Uno Menos” or “Not one less.”

According to the World Health Organisation, 35 per cent of women’s murders are committed by a current or former partner. This compares to just 5 per cent of men.

Physical and sexual violence affects a third of women, globally.

Learn more about femicide and the protests in Argentina with this Reuters report.

Related content: 

Rosie Batty appeals for more media freedom to report domestic violence.

Australian police deal with domestic violence every two minutes.

Women victims blamed for domestic violence.

Domestic violence: Aboriginal women are 38 per cent more likely to be hospitalised.