He has found there is "simply a lack of evidence" surrounding the disappearance of Maureen Braddy and Allan Whyte.

He acknowledged while he believed they were dead, and foul play was most likely involved, there was not enough evidence to charge anyone.

He gave four main reasons for his findings, including the fact no bodies had been found, there were no eyewitnesses to the crime, there was no strong circumstantial evidence and "there is a simply a lack of evidence".

He said that suspect Stanley Braddy, Maureen's father, was "unco-operative and evasive", but there was not enough evidence to conclude Mr Braddy was either directly or indirectly involved in Braddy and Whyte's disappearance.

He said "suspicion and speculation" could not form the basis of charges.

He said Maureen's sister's account of seeing her father carrying a body the night the teenagers disappeared in 1968 was not "sufficiently reliable".

He said the mind sometimes "unconsciously invented" scenarios to "fill gaps", referring to the fact Lyn Ireland was able to better recall what she saw while under hypnosis as an adult, many years after her sister's disappearance.

Outside the court, Ms Ireland said she was upset with the coroner's findings.

"I just can't believe it," she said.

"I don't understand ... I'm not a happy girl."

But Ms Ireland vowed to continue to push for further investigations into her sister's disappearance.

"I'm not stopping here," she said.

Shane MacDonell, son of Maureen's sister Debbie, said the family was "gutted" by the coroner's findings.

"Everyone's upset with what he just said in there," he said.

Mr MacDonell's wife Jodie said the unsolved disappearances had affected generations of the Braddy family.

"Our kids have grown up with it," she said.

"It's very disappointing ... But we'll keep going. You don't start something then stop just because you've hit a hurdle."

She said the family's determination to continue with the case stemmed from a strong desire to find Maureen and Allan's bodies, to lay them to rest and achieve closure over their deaths.

Maureen Braddy was reported missing on November 24, 1968, and Allan Whyte is believed to have been reported missing the same day, although there is no record of this.

The pair were last seen at a dance at the YMCA Hall in Mundy Street, Bendigo, on the night of Saturday November 23, 1968.

Whyte was aged 17 and Braddy was 16.

The findings relate to inquests conducted in March 2012 and March 2013.

- Bendigo Advertiser