The partner of missing Darwin woman Carlie Sinclair has been arrested on suspicion of her murder, as police say they have found her gravesite.
Video of Danny Deacon being arrested in Darwin on Friday was broadcast by the Nine Network.
Police will not confirm the name of the man arrested, but say he was known to Ms Sinclair, 35, and had left the Northern Territory soon after her disappearance, returning less than 24 hours ago.
"Earlier today, as a result of a man being seen in Berry Springs area, he has been arrested and we will be holding him in custody until the results are known of a comprehensive crime scene analysis," NT Police Commissioner John McRoberts told reporters.
Ms Sinclair was last seen by Mr Deacon, on July 18 last year.
They had an argument at the business they ran together, Darwin Decorative Concrete, and Mr Deacon said she walked out, leaving behind her belongings, car, and young son Alex.
The case has fascinated the Top End for the past 18 months, with widespread campaigns to help find Ms Sinclair and a $250,000 reward offered for information leading to her whereabouts.
On Friday afternoon forensic officers established a crime scene and were examining a private property on Wheewall Road in Berry Springs, about 60km south of Darwin.
Police had previously searched the site 10 days after Ms Sinclair's disappearance after receiving a tip-off that Mr Deacon's 4WD was seen in the area on June 18, News Corp Australia reported.
Based on comments the man had made and as a result of the investigation, along with "the fact that we have what is clearly a grave site in Berry Springs, we are very confident we have solved the mystery of the disappearance of Ms Sinclair", Commissioner McRoberts said.
He said the man was surprised to be arrested, and charges are pending.
Police expected to confirm the body found as Ms Sinclair's by Saturday morning.
"We know you are grieving and nothing I say or we do will bring Carlie home," Commissioner McRoberts said in a message to her family.
"But I do hope that today's events will give you some comfort that we have found your daughter and will enable you at some point in time to have some degree of closure."
