Analysis of a mystery object which killed Rutger Hale when it crashed through the windscreen of his car last October has provided little new information to advance the case.
The object, which has not been located, struck and fatally injured Mr Hale, 22, on October 24 as he drove between Lake Hawea and Wanaka.
Material from the mystery object obtained from Mr Hale's Subaru was sent to both ESR and the University of Otago for analysis.
The tests revealed that the unknown object was made of or contained fragments of stainless steel of a common grade used in vehicle parts and other everyday items such as tools and cookware, police said.
The object also comprised common minerals naturally occurring in soil or dirt in the South Island.
