A Symonston man, 45, has been arrested in relation to the suspicious death of another man, 61, in Wanniassa on Tuesday night.
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Police said he was a suspect in the homicide investigation into the man's death after the victim was found dead at a McWhae Circuit house with significant blunt force trauma injuries to his head.
An invalid woman, 68, was found unharmed in a bedroom.
ACT Policing Detective Sergeant Stephen Ladd said the man was helping detectives with their inquiries but no charges had been laid late on Wednesday afternoon.
Detective Sergeant Ladd said the man was found in O'Connor and co-operated when police took him into custody about 3pm.
He said the man was the person of interest police earlier said they wanted to speak to over the death.
"He is known to the family but we're not prepared, at this early stage in the investigation, to divulge the specific relationship."
Police remained at the scene throughout Tuesday night and forensic teams examined the house on Wednesday. They had taped off a large area around the home and neighbouring reserve.
Markers dotted on the ground around the crime scene read "urine" and "wooden handle".
Crime scene investigators combed the house and surrounding area for evidence and seized several items as part of the investigation.
ACT Policing officers and members of the AFP Search and Rescue team and the State Emergency Services were conducting line searches.
Police said the death was an isolated incident and no members of the public had been in danger before the man's arrest.
Neighbours expressed their shock at the alleged killing in their quiet suburban street.
Neighbour Victoria Leuii said the first she knew of the death was when police knocked on her door about midnight. She said the street and her front lawn were soon crawling with police with torches.
She said the house where the man's body was found was so quiet she didn't think anyone lived there.
"I never even saw cars going up and down the driveway or anything, the bin was never outside. That's why it was so shocking."
One woman who lived across the road believed the man and woman had lived in the house for about 25 years but said she had rarely seen them.
"They never came out. I saw the lady once in the shop with him. When I saw him he'd say hello or how are you and that's it.
"This street is very quiet. We haven't heard anything.
"I worry because we're always at home. We always have everything locked, but you never know."
Another woman who lived across the road from the house said police and paramedics had crowded the street overnight but she heard "not a thing".
"You never saw anyone there at all."
Neighbour Matthew Calaby said the street was very quiet and the man seemed "quite nice" when he doorknocked the house for fundraising several years ago.
"I don't think you'd get many rough types in this street."
Another neighbour Tom, whose property backed on to the house, said he's heard little from the residents since he moved there about 20 years ago.
"I never saw any visitors. It was very much an ultra-quiet house where you didn't see anyone. I would not see a car coming and going.
"On the other hand there were no parties, no fights, no yelling.
"It's not an area that's had an issue with a particular crime. It's your classic Canberra quiet 'burbs."
A post mortem on the man's body was yet to be scheduled. A report will be prepared for the Coroner.
The death happened one week after single mother-of-three Tara Costigan, 28, was allegedly attacked with an axe and died at her Calwell home.