A woman has unknowingly livstreamed her own murder while she was busy filming a heated argument between her neighbours.

A video has shown the moment a young woman was shot on Wednesday, September 27 as she filmed a vicious fight between her two neighbours.

The 22-year-old lady identified as Willyene Mathias Siqueira, a mother-of-three, had been filming an argument going on between her neighbours on her cellphone.

The neighbours, a husband and wife had started arguing in their home, then they took the fight out into the street in Santana de Cataguases, Brazil. The argument was reportedly resulting from a row about their children.

As Willyene filmed the fight, her 40-year-old neighbour, the man fighting his wife, walked up to her, pulled a gun from his pocket and shot her twice reportedly while trying to shoot the cell phone she was recording with.

The fight occurred in Santana de Cataguases in the state of Minas Gerais in Brazil. Willyene was taken to the Hospital de Cataguases where her condition was initially described as "critical".

She later died on Saturday.

Military Police launched a manhunt for the 40-year-old suspect, who had fled his home. He was found a few hours later in his house, where officers also discovered a gun and ammunition. He is now in police custody and could be charged with murder.

Watch the shooting below: