A coronial inquest into the disappearance of a Western Australian Aboriginal man in the early 1990s has seen a founder of the Kimberley Land Council deny any involvement in the disappearance and suspected death.

On Thursday, Kimberley Land Council founder John Watson gave evidence denying involvement in the the disappearance of 24-year-old Richard Milgin, a local of the Kimberley community of Looma who was last seen in late 1993 or early 1994.

Mr Milgin was known to be in a 'wrong skin' relationship with 23-year-old woman Julie Buck, whose remains were found about a year after the pair disappeared.

Their union is said to have caused unrest within the community.

As first reported by the ABC, the court heard Ms Buck had been "promised" to Elder Jimmy Nerrimah, and that tribal punishment was a customary way of dealing with such relationships, raising concerns about Mr Milgin's plight.

Testifying via video link, Mr Watson, who is Mr. Milgin's stepfather, asserted his innocence in the matter.

"I had nothing to do with it. That was his business," Watson told the court, referring to Julie Buck's alleged promise to an Elder, Jimmy Nerrimah.

"Never talked about it, never talked about them."

Mr Watson said he had looked for Mr Milgin in Wyndham, Fitzroy Crossing and Kununurra, and although acknowledging the relationship between Mr Milgin and Ms Buck was considered "culturally wrong", he denied going to the home of a friend of Ms Buck with Jimmy Nerrimah carrying sticks.

He also maintained there would have been no consequences for such a relationship, saying he never discussed the matter or witnessed any harm towards Mr Milgin.

Mr Watson found it challenging to recall a statement he made to police in 2016 about Mr Milgin "taking off in a gap in the hill," saying he could not recall what he meant at the time.

When asked about tribal punishment, Mr Watson, who is in his eighties, said he found it difficult to hear over the video link.

Speaking outside of the courtroom, Mr Milgin's auntie, Rosita Shaw, offered insights into the concept of tribal punishment and its cultural significance.

She stressed that such punishment could only take place in the presence of family members and community members, whilst expressing concern over potential misunderstandings of intergenerational practice throughout the broader community.

Anthony Watson, Mr. Watson's son and current Kimberley Land Council chair also testified, saying he last saw Mr Milgin in 1993 and was later informed that he had "ran off" with Ms Buck.

During the course of the inquest, coroner Michael Jenkin acknowledged rumours of tribal punishment were never substantiated, finding "no credible basis for any assertion" that Mr Watson or his son were involved in Mr. Milgin's disappearance.

Stating it was an "incredibly sad case", Coronor Jenkin also reflected on the possibility of finding beyond reasonable doubt that Richard Milgin was deceased. However, he asserted that the cause and manner of death remain unknown.

Although many questions relating to Mr Milgin's disappearance remain unanswered, Ms Shaw said the inquest had been helpful to the family.

"There's a lot of missing links there. It's not going to stop here," Ms Shaw said.

"We're still going to go back and look for my nephew Richard."

Mr Shaw said it had been "very traumatising," especially for her sister that Mr Milgin had not been laid to rest.

"She's getting old and she wants to know where her son is," Ms Shaw said.

"It's very emotional for us today, we still want to find answers and we still want to lay him to rest (and) bring him back home."