Anthony Harvey Pleads Guilty To Killing Partner, Her Mother And Three Daughters

Anthony Harvey, a 25-year-old Perth man, has pleaded guilty to killing his partner, her three daughters and his partner's 73-year-old mother in Perth last year.

Harvey appeared in Stirling Gardens Magistrates Court via a video link from prison when he admitted to the gruesome murders.

He has been held in custody since he handed himself into Pilbara District police in early September last year.

Harvey's surrender led police to a suburban home where they found the bodies of two-year-old twins, their three-year-old sister, their 41-year-old mother Mara Harvey and the children's grandmother.

Mara and Anthony Harvey.

The two women were found in the kitchen while the children's bodies were discovered in other rooms of the house.

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The murders were gruesome: the family had been killed with a combination of blunt force trauma and stabbing.

Assistant Commissioner Paul Steel described the mass killing as a "tragic event" and described the discovery of the bodies as a traumatic event for the first responders, as well as for the family and wider community.

Police officers confronted by a brutal scene inside the family home. Source: AAP.

There has so far been no indication of Harvey's motivation for the killings and speaking in a television interview, Mara Harvey's sister, Taryn Tottman said that there was "no indication of trouble or problems in the family" before the killings.

Harvey will face sentencing in June and is likely to face life sentences for the murders.