Police have put out a renewed appeal for information - about a Marlborough woman who disappeared a year ago

27-year-old Jessica Boyce was last seen on March 19, 2019.

Her disappearance was upgraded to a homicide investigation in October.

Boyce's mother's red ute was found near Lake Chalice - with Boyce's wallet and phone inside - three days after she disappeared.

Police say they've been given a significant amount of misinformation - which they say is a deliberate attempt to mislead them - and several people of interest have also left the region.

Despite these obstacles - police say anyone with information should get in touch.