A witness, who cannot be identified for legal reasons, told police details of the young woman’s final moments - including how she was tied to a chair and punched in the face because she was ‘‘screaming and screaming’’ - during a recorded interview in May last year.

Those details emerged during a committal hearing at Parramatta Children’s Court yesterday for a 19-year-old man accused of being an accessory to Louise’s murder.

Bellambi grandmother Patricia Goddard has pleaded not guilty to murdering the 18-year-old, whose badly decomposed body was found buried in a wheelie bin in Goddard’s Chounding Crescent backyard on February 27 last year.

Her daughter, Tracey Karen Taylor, has pleaded not guilty to being an accessory after the fact.

Yesterday the court was told Louise was at Taylor’s Woonona home when she was tied to a chair and then ‘‘king hit’’ by the 19-year-old co-accused with a force so strong it knocked her and the chair over.

The witness then claimed the unconscious teen was placed in the bath with warm water and left alone for some time before Goddard started to ‘‘panic’’ about her condition.

She was then allegedly moved to a laundry-type room at the back of the house, where she was wrapped in a blanket, propped up against two fridges and left lying alone on the cold cement floor with a small heater.

The court heard that when the witness later checked on Louise, her eyes were closed, her face was blue and she had no pulse.

The witness told police the 19-year-old co-accused later claimed Louise still had a pulse, but the witness thought it was a lie.

Yesterday, however, the witness was less sure of his account, telling the court during cross-examination he could not remember the last time he saw Louise.

He also said he could not recall how Louise was tied to the chair, despite initially telling police she was restrained with rope.

The hearing continues today.