Four people went to the door of Glen Jones' small Featherston flat the night he was fatally beaten, a witness says.
Cassandra Granich said she and another woman stood by the fence while the four went to the flat, knocked and asked to be let in.
In the High Court at Wellington today she said she heard a man's voice reply, "Hold on".
A man's voice yelled, "You raped my mum."
"A male's voice said, 'No I didn't, I didn't do it".
Ms Granich said she heard, "Stop it" and then yelling, and she left.
She had been with a group in Masterton earlier in the evening where a friend, Tariana Jones, had said a man had raped someone's mum.
"We only thought we were going down there to smash windows and give him a fright, not what happened," Ms Granich said.
But just before they left Masterton Jones changed into a pair of Doc Martens and said she was putting on her stomping boots.
The Crown says Jones, 33, instigated a vigilante attack on Mr Jones. Mr Jones was a 40-year-old supermarket worker who had various disabilities as a result of a brain tumour he had when he was a toddler.
The jury has been told that a rape complaint was made to police about him about a month before he was killed, relating to an incident about a month before that. However the jury is also expected to hear evidence that Mr Jones and the woman who accused him also had consensual sex afterwards and were seen cuddling.
Tariana Jones, Kristofer Lee Jones, 24, Matthew John McKinney, 29, and Hayden Ranson, 28, have pleaded not guilty of murdering Mr Jones on January 12, last year.
McKinney and Ranson pleaded guilty to a charge of aggravated burglary of Mr Jones' flat. Tariana Jones, Kristofer Jones, and Toni Maree Miller 23, have pleaded not guilty of aggravated burglary.
Miller is alleged to have driven one of the cars. Ms Granich said Miller was standing by the fence with her and both of them left when they heard the yelling and screaming for help.
Ms Granich was supposed to give evidence last week but she did not come to court and a warrant was issued for her arrest. She was present when she was called to be a witness today.
The trial is continuing.
- The Dominion Post
How many coffees do you have a day?Related story: Coffee as we know it at risk of dying