Damning evidence that revealed Brenden Bennetts searched online for "best way to dispose of a body" the day before he killed schoolgirl Jayde Kendall was only unearthed the day his murder trial began.
The last-minute find meant the YouTube search was almost kept from the Brisbane Supreme Court jury, which convicted the 21-year-old of murder on Thursday afternoon.
Bennetts last week pleaded guilty to the manslaughter but denied he intended to cause 16-year-old Jayde's death in August 2015.
It can now be revealed crucial evidence showing Bennetts may have premeditated Jayde's death was only discovered on the first day of his trial.
Police computer analyst Neil Robertson was reviewing his report into data gleaned from Bennetts' Samsung handset on September 4 when he came across a previously unnoticed YouTube search.
It showed Bennetts had searched for "best way to dispose of a body" at 12.19pm on August 13, 2015 - the day before he killed Jayde.
Her body was found in a field on August 27 too decomposed to determine a cause of death.
Defence barrister Michael Copley QC failed in a bid to have the new evidence kept from the jury, arguing there was no way to know what, if any, search results Bennetts actually looked at.
But prosecutor Vicki Loury QC said it did not matter what results Bennetts received or watched, just the fact he had made the search at that point in time.
The new evidence drastically changed the course of the trial as it led to Justice Ann Lyons also allowing previously inadmissible Facebook conversations between Bennetts and Dillan Gilmore in England to be read to the jury.
In the Facebook conversations Bennetts described himself as not having emotions and being "a threat".
He also made an unprompted comments about death and loss to Ms Gilmore shortly after the body disposal YouTube search.
"Death, such a weird concept," Bennetts said.
"Have you ever lost anyone? I haven't but I have never understood (it).
Guess I'll know soon."
"I don't know if we can talk anymore. I like you. I don't want to bring you into this."
Mr Copley had been successful before the trial, however, in having Bennetts' final interview with police kept from the jury as investigators neglected the 18-year-old's right to silence and legal representation.
The interview, on August 21, was just after police retrieved the sexually suggestive text messages between Jayde and Bennetts that proved he lied about why they met after school on August 14.
"She just told me to stop," Bennetts said.
"I didn't want to pressure her into doing anything she didn't want to do. I'm not that person.
"I guess we both got carried away."
At the time Bennetts was under arrest for murder but released that night after a covert strategy to get him to open up to an undercover officer in the watch house cell failed to elicit more evidence.