Sister killer found dead in cell

A woman who was jailed for stabbing her sister to death in 2008 following a fight over internet access has been found dead in her prison cell.

Kathleen Worrall, 22, was found dead in her cell on Sunday morning, Macquarie radio said.

Worrall stabbed her teenage sister Susan to death at their family home at Strathfield in Sydney's inner west two years ago after discovering that an internet password had been changed.

Worrall was sentenced to four years and three months non-parole with a balance of one year and nine months.

The pair began exchanging death threats after a fight over hair straighteners lead to blows, about a month before the killing, according to the Dailiy Telegraph.

Macquarie said it's believed Worrall died from natural causes.

- AAP / STAFF