The sister of a rugby league star has been charged over the death of her boyfriend, after an alleged domestic violence incident at the weekend.

Jade Walker, older sister of Manly Sea Eagles centre Dylan Walker, faced Sutherland Local Court on Monday charged with manslaughter and aggravated break-in.

Ms Walker, 31, was allegedly involved in an incident with Gilbert Caetano, 51, at his parents' home at Brighton Le Sands, in Sydney's south-east, about 1.10am on Sunday.

Police said Mr Caetano suffered severe injuries and died at the scene.

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Jade Walker (far right), the older sister of rugby league star Dylan (centre), has been charged over the death of her boyfriend Gilbert Caetano at a home in Sydney's south-east over the weekend

Ms Walker (left), 31, was charged with manslaughter and aggravated break-in over the death of Mr Caetano (right), 51. She was due to front Sutherland Local Court on Monday morning

Daily Mail Australia understands Walker, a transgender woman, had been involved in an 'on and off' relationship with Mr Caetano, a father-of-one.

Appearing in Sutherland Local Court, police prosecutors applied for an order to gather forensic evidence from Ms Walker. She will reappear in court next week.

At the Mascot hair salon where Ms Walker worked, staff declined to comment.

'We don't want to talk about it,' a staff member said.

On Ms Walker's social media accounts, she describes herself as transgender.

'#transgender #transisbeautiful,' she posted to her Instagram account.

On Sunday morning his heartbroken daughter Jessica Caetano told media outside the Brighton-Le-Sands home that she knew little of her father's girlfriend.

'I don't really know the full story but she's been around for a while,' Ms Caetano said of her father's lover.

On Ms Walker's social media and Instagram accounts, she describes herself as transgender

Mr Caetano's heartbroken daughter Jessica (left, pictured with her mother and Mr Caetano's ex-wife) told media outside the Brighton-Le-Sands home where he was killed that her father 'did not deserve this'

Neighbours claimed they heard a woman yelling at the house on General Holmes Dr, followed by a 'loud bang'.

Ms Caetano said her father 'was a kid at heart' and her family was left shattered by his death.

'The best way to describe him is probably a kid at heart... a fun, loving and caring person,' Jessica said, with her mother and Mr Caetano's ex-wife by her side.

'I don't think he deserved this at all.'

Police were called to the home at 1.10am on Sunday where they allegedly found Mr Caetano unconscious and attempted to revive him, but were unsuccessful.

Neighbours claimed they heard a woman yelling at the house (pictured) on General Holmes Dr, followed by a 'loud bang'

Mr Caetano's father, who is understood to own the home, was celebrating his 80th birthday on Sunday.

Manly Sea Eagles released a statement on Monday afternoon saying they would be supporting Walker's family throughout the legal proceedings.

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'Manly Warringah Sea Eagles have been advised today of a serious legal matter involving a close family member of NRL player, Dylan Walker,' the statement read.

'The Club's focus during this challenging period... is on fully supporting Dylan and his family.'

Walker suffered a serious eye socket injury during Manly's clash with Melbourne on Saturday night - just hours before the alleged incident involving his sister.