AN Argentine teenager is accused of shooting her boyfriend dead just hours before declaring her eternal love for him in a gushing Instagram post.

Nahir Galarza, 19, reportedly confessed to using her father's gun to shoot Fernando Pastorizzo twice in the chest.

5 Nahir Galarza, 19, is accused of shooting her boyfriend dead in Argentina Credit: Central European News

5 Galarza posted a gushing Instagram post declaring her love for Fernando Pastorizzo shortly after she is alleged to have killed him Credit: Central European News

She then posted a Instagram photo of Fernando, 20, tenderly kissing her shoulder, with the caption: "Five years together."

The post continues: "Fighting, coming and going, but always with the same love. I love you forever, my angel."

Pastorizzo had been gunned down outside the city of Gualeguaychu, 230km north of the capital, Buenos Aires.

Galarza is alleged to have broken down and confessed to the crime after police found the murder weapon and suspected the her father of the crime.

5 Pastorizzo had been gunned down outside the city of Gualeguaychu, 230km from Buenos Aires Credit: Central European News

5 Galarza posted this picture of Pastorizzo kissing her shoulder alongside the caption: "I love you forever, my angel" Credit: Central European News

She told the Gualeguaychu prosecutor’s office how she shot her boyfriend before returning home at around 6am.

Galarza then put her father's gun back in its holster before going to sleep, it is reported.

After her confession, Galarza was transferred to a psychiatric hospital for evaluation.

The prosecutor in charge of the investigation, Leandro Beherán, said she does not suffer from "psychological or mental problems".

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5 Galarza allegedly confessed when the police found her father's gun and suspected him of the crime Credit: Central European News

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Galarza, who went out with Pastorizzo for five years before they broke up in December.

Along with a friend, she is also alleged to have assaulted him outside a nightclub a few days before he died.

The teenager is a student at Centro Regional Gualeguaychu University, according to her Instagram profile.