Young NRL star Bryce Cartwright has become the victim of a revenge porn attack after his former girlfriend allegedly posted lewd images and videos online.

The Penrith Panther's former partner Brittany Hura allegedly threatened to put Cartwright "six feet under" in one video after bemoaning he can't "pleasure" a girl, The Daily Telegraph reports.

"You think I'm laughing because I'm mentally f----ed up?" the newspaper quotes Ms Hura as saying in one of the videos.

"I'm not mentally f----ed up I'm just laughing at you… you're going to be dead soon."

Ms Hura and Cartwright had been in a relationship for about six years before it ended.

She then reportedly added: "Don't worry about me I'll be somewhere … on CCTV."

It has also been claimed Ms Hura posted screenshots of messages between the pair that involved inappropriate behaviour. The exact content of the messages is not known.

One of the screenshots was allegedly uploaded to a porn site with the caption "Bryce Cartwright".

As well as screenshots, Ms Hura posted a photo of a tattoo on her back with Cartwright's name, with a new tattoo: "R.I.P".

Bryce Cartwright plays NRL for the Penrith Panthers.

Ms Hura's social media accounts had been suspended until overnight when she posted a video to Facebook threatening to kill the young sportsman. The videos have since been removed.

Ms Hura and 22-year-old Cartwright had been in a relationship for about six years before it ended. It is believed Cartwright's new relationship is what has triggered the revenge attack.