Keith Yandle and 19-year-old son Marco charged with murder as police confirm body inside Kudla bunker is missing father Steven Murphy

A man and his teenage son have been charged with murder over the death of missing man Steven Murphy, whose body was found buried in a bunker at a Kudla shed.

Police have located a human body during a search of a property at Kudla, south of Gawler, for the body of missing man Steven Murphy. Picture: 7 NEWS

A father and son have been charged with murder after the body of missing man Steven Murphy was found buried in a bunker behind a Kudla property.

Keith Yandle, 46, and his son, Marco Yandle, 19, were charged with murder on Thursday shortly after the remains were confirmed to be that of Mr Murphy.

Mr Yandle was initially arrested on Tuesday over drugs and firearms offences after a raid of his Kudla home.

Steven, 38, was last seen at Kudla on Wednesday, February 15. Picture: SA Police

Both men were refused bail and remanded in custody to appear in the Adelaide Magistrates Court at a later date.

Earlier on Thursday, police confirmed the remains found during a 48-hour search of the property were those of missing man Steven Murphy.

The police search, involving major crime detectives along with Barossa CIB and crime scene specialists, began at a property south of Gawler on Sunday after a tip-off the missing northern suburbs man, 38, might be there.

On Tuesday evening, police found human remains in a large man-made bunker measuring 15m by 15m within a shed at a property’s rear, assisted by SES crews using excavating equipment.

On Wednesday, they seized evidence from the shed and “gravesite” within the bunker, which they believed had been dug over a “long period of time” but not completed by the time of the discovery.

Speaking at the time, Det Insp McEachern said police believed the body had been inside the bunker for “up to six weeks”.

Police had spoken to Mr Murphy’s family since making the discovery.

Police searching the property at Kudla, south of Gawler. Picture: NCA NewsWire / Kelly Barnes

Police search the cluttered shed at the Kudla property. Picture: 7NEWS

Police outside the property on Ormsby Rd, Kudla. Picture: Kelly Barnes

There had been speculation online Mr Murphy was sleeping in a swag at various locations around the township and may have been squatting in the shed.

Police located 20 cannabis plants being grown hydroponically in a rear shed and a .22 rifle and ammunition during the raid on Monday.

Several tonnes of dirt were removed from the property on Tuesday, along with several cannabis plants, bulbs and reflective sheets.