The family of a Melbourne couple executed in their own home say their only remaining avenue for justice is a royal commission into police corruption.
The bodies of police informant Terence Hodson, 56, and his wife Christine, 55, were discovered in the family's Kew home on May 17, 2004.
Victoria's coroner issued an open finding on Friday on the deaths, which exonerated Victoria Police amid claims it did not do enough to protect the couple.
More than one offer of the highest level of witness protection was made to the Hodsons but they declined, State Coroner Ian Gray found.
The coroner also said there was not enough evidence to support the theory the couple were killed by hitman Rodney Collins, as the result of a contract arranged by underworld figure Carl Williams at the request of former detective Paul Dale.
The Hodsons' daughter, Nikki Komiazyk, broke down in tears on Friday as she denounced the open finding and repeated a call for a royal commission.
"There's no justice for us ... no justice for my parents," Ms Komiazyk said.
Both Collins and Dale have denied any involvement.
