A Louisiana man has pleaded guilty to murdering his ex-girlfriend while she was livestreaming on Facebook.

Johnathan Robinson, 37, pleaded guilty on Thursday to avoid the death penalty for shooting dead 27-year-old Rannita Williams in April last year.

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The plea agreement means he cannot be sentenced to death and must be sentenced to life in prison without parole.

Prosecutors said Robinson will also get a concurrent 100-year sentence for shooting at police during an 80-minute standoff with eight officers.

He was heard muttering: 'Everybody wanna be famous, let's be famous today.' Williams was still filming when Robinson fired six shots and she was seen collapsing to the ground.

The terrified woman could be heard screaming 'stop Johnathan' as he opened fire on her and the phone crashed to the ground.

At the end of the video, a shadow of the rifle could be seen in view of the camera as Robinson stood over the victim.

He was caught on camera saying: 'Now b****, game over. Game over b****.' Dozens of officers rushed to the scene after the shots were fired.

When they arrived, officers exchanged gunfire with Robinson for nearly 90 minutes before they could arrest him.

Williams was rushed to the hospital, but she died of her gunshot wounds. Her family said that she previously dated Robinson off and on for years, but the pair broke it off permanently about two years ago.

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