It started with a trip to the pub on a Friday night. But what unfolded between a group of ice-addled young men over a weekend in suburban south-western Sydney is hard to fathom.

Twenty-year-old Dane McNeill was subject to what the coroner described as a "lingering death" – beaten, stabbed, bound and drugged before his body was stuffed into a suitcase, dumped in a reserve and set on fire.

Victim Dane McNeill was attacked after asking for help with a debt.

Azam Charbaji, 26, and his brother Haysem, 24, were found guilty of the brutal murder by a jury on Wednesday after a trial lasting nearly a month in the NSW Supreme Court.

Haysem's then girlfriend Lexy May Jamieson, 26, was found guilty of accessory after the fact after she sought advice on how to clean up the murder scene and dispose of the body.