Updated 5.21pm: A 16-year-old has been charged with murder following the death of an elderly man in Christchurch this morning.

Police spokesman Detective Inspector Tony Hill says the man and the teen were known to each other.

The man's body was found in his home at Owens Terrace in Upper Riccarton, but a second address has also been cordoned off and is being treated as a crime scene.

Police have spoken to a number of people who knew the victim, and crime scene investigations will continue over the coming days.