Police make another plea for information a year after mysterious disappearance of Christchurch man

The 49 year old builder has not been seen since May 21st last year, when he left his Halswell home without his car or bike, and with his wallet inside the property.

An initial search for McGrath began in greater Halswell ... before police focused in on school friend David Benbow, searching both his home and his mother's.

Police then conducted a 70 day landfill search in Waipara last June.

Michael's brother, Simon, posted a moving tribute on social media in November, where it seemed he conceded that Michael was no longer alive.