Workmate of missing Jack McLennan says he's 'given police absolutely everything'

Chris Duke says his family and work life suffered after Jack McLennan's disappearance. (Facebook)

The last known person to see missing Queensland man Jack McLennan alive has broken his public silence amid intense community speculation over his role in Mr McLennan's disappearance.

Chris Duke, a workmate of Mr McLennan, said he was with him in the moments before he disappeared around 10pm from Ficks Crossing, three hours' north-west of Brisbane, on October 4, 2024.

In a series of exclusive interviews with the ABC Unravel podcast What Became of Jack? Mr Duke confirmed both he and Mr McLennan consumed methamphetamine and alcohol while hanging out together for at least eight hours that day and evening.

But he has rejected online accusations that he was involved in Mr McLennan's disappearance and said he fully co-operated with police.

"All that stuff on Facebook … I don't even know where they come up with it," Mr Duke said.

"I've worked with the detectives and the CIB [Criminal Investigation Branch] as much as I can."

Queensland Police have never declared Mr Duke, or anyone else, a person of interest in their investigation.

Mr Duke said at the time Mr McLennan disappeared he was cleaning his car, and when he looked up Mr McLennan had vanished.

"At the end of the day, I don't even know where he went," Mr Duke said.

The mysteriousness of Mr McLennan's disappearance has been compounded by findings that his belongings, including his shoes, hat, wallet and bank card, were found scattered in a nonsensical pattern over 5 kilometres of mostly countryside.

A shoe confirmed to belong to Jack McLennan was found as part of a search. (Supplied: Queensland Police Service)

His phone, shirt and shorts have never been found, nor have any human remains.

Mr McLennan also moved out from the house he shared with his girlfriend that same day.

Mr McLennan's family, supporters and an online sleuthing community have criticised Mr Duke for not providing more information to Mr McLennan's parents.

"There's so many questions I've never had answered," Mr McLennan's mother, Kellie Moody, said.

"I want to sit with Chris. I want him to look me in the eye.

"It would've been nice if he had said: 'Look, I don't want any anger. I want to help you with your questions.'"

Kellie Moody has spent countless hours searching through the bush for her son. (ABC Sunshine Coast: Ollie Wykeham)

Mr Duke said he was cooperative with the family until he felt discussions became repetitive, accusatory and threatening.

He said he was targeted in the community and his family was harassed.

"I've