Max Sica has been found guilty of brutally murdering his ex-girlfriend and her two siblings.
The Brisbane Supreme Court jury took less than four days to return three guilty murder verdicts in what has been the longest murder trial in Queensland's history.
Sica, 42, had denied killing Neelma Singh, 24, Kunal Singh, 18, and Sidhi Singh, 12, and dumping their bodies in the spa of their family home in the outer Brisbane suburb of Bridgeman Downs.
He claimed he found the bodies on April 21, 2003, and has consistently maintained the deaths were caused by someone else prior to his arrival.
However, the jury accepted evidence presented during the 78-day trial that Sica strangled Neelma and killed Kunal and Sidhi with a garden fork so they wouldn't tell anyone what they had seen.
The charge of murder carries a sentence of life imprisonment in Queensland.
Sica showed no emotion when the verdict was read out.
Asked if he had anything to say, he replied, "I didn't kill no one and the Queensland justice system is corrupt and that's all I've really got to say, sorry about that."
The matter was adjourned for sentencing on Thursday.