Christchurch police have launched a homicide investigation following the death of a man in Linwood.

At around 2:50pm on Sunday, police received a report that 57-year-old Michael Joseph Graham required medical assistance at an England Street property.

Emergency services attended however Mr Graham was declared dead at the scene.

Detective Senior Sergeant Sarah Illingworth said enquiries have established he was involved in an assault at the address. 

Police would like to speak to Nathan Te Hana as part of the ongoing investigation.

Te Hana, 46, is believed to be in the Christchurch area.

If you have seen Te Hana or have any information which can help Police locate him please contact 111, quoting file number 210103/2420.

You can also provide information anonymously via Crimestoppers on 0800 555 111.