Mark and Faye Leveson had mixed feelings on Tuesday after a coroner said she could not make a finding as to the cause and manner of the 20-year-old's death in Sydney on September 23, 2007.
"There's some relief, there's some frustration, there's some anger, so there's lots of emotions going through us but relief's one of the ones right now," Mr Leveson told reporters outside Glebe Coroners Court.
Deputy State Coroner Elaine Truscott's findings came two years after the inquest began and more than eight years after Matthew's boyfriend, Michael Atkins, was acquitted of murder.
File image from 2008 of Matthew Leveson (right) with Michael Atkins from Facebook. Atkins was acquitted of the younger man's murder in 2009. Source: AAP
The coroner said Atkins was the only person who could provide the answers as to how Matthew died, and he'd been given the opportunity to do so during his protected evidence at the inquest last year.
"For reasons unknown to me, he did not take that opportunity," Ms Truscott said, later adding that although she could not find that Mr Atkins was involved in any acts which were causative to Matt's death, Leveson’s former partner had not been a "witness of truth".
"However, it does not follow ... from that degree of suspicion that I can find that Mr Atkins was involved in any acts which were causative to Matt's death."
The 54-year-old this year finally led police to Matthew's remains in a south Sydney national park after striking a deal to avoid contempt and perjury charges over lies he told during his inquest evidence.
He told police he panicked and buried his boyfriend's body in bushland after finding him dead from a drug overdose.
The Levesons don't believe Atkins' latest version of events and still allege he's responsible for their son's death.
But although they want justice, they say they achieved their main goal from the inquest - to find Matthew and bring him home.
"Our son was the most precious thing to us and to his brothers, why would we worry about Atkins," Faye Leveson said on Tuesday.
"We would have loved both but we were forced in this corner, and Matty comes first every time."
