Rockhampton resident Allan Reinikka Rokawinner said he was leaving the newsagents when he heard a voice tell him, "Put a ticket in."
Rokawinner thinks the voice must have been his wife Jo-Anne, who died in November 2013, because the subject of a new car had always been a topic of conversation between them.
"When I found out [about the win] I picked my jaw up off the floor, I thought it was fake," Rokawinner said.
He'd been driving about in a Toyota Corolla for about eight years and doesn't normally play the lottery.
"It was just a one-off. I put a ticket in the jackpot draw for some strange reason because I heard a voice. So I did what I was told," he said.