On a Sunday afternoon in Christchurch in 1996, scrap metal dealer John Reynolds failed to return home for lunch. Later that evening, his brother found the 55-year-old lying in a pool of blood at the scrap yard.

Fifty-five year old John Reynolds was discovered lying in a pool of blood at this scrap metal yard in 1996.

He had been hit repeatedly around the head with a blunt instrument.

More than two decades on, Mr Reynolds' killer has never been found but the case is still very much alive.

Blair Ensor and Martin Van Beynen investigated the murder for the three-part Stuff podcast, Heavy Metal.

They were told there were no signs of a struggle, suggesting Reynolds was hit from behind and incapacitated and if robbery was the motive, the killer missed $2200 in the top pocket of his work shirt.

Go to this episode on rnz.co.nz for more details