Harry Potter star Daniel Radcliffe is mourning the death of his grandmother following her death last week.

Elsie Radcliffe, who lived in Northern Ireland, passed away on Thursday after a long battle with ill health.

The 79 year old - mother of Alan Radcliffe, the actor's dad - was her grandson's biggest fan, and flew to London last year to see his West End stage debut in controversial play Equus, despite suffering from heart problems.

A close family friend tells The Belfast Telegraph, "She just lover her grandson so much and was so proud of him. Elsie was his number one fan and loved all the Harry Potter movies."

Her funeral is due to take place at the First Presbyterian Non-Subscribing Church in Banbridge, Northern Ireland, this week.

It is currently unknown whether the 18-year-old, who is starring in the Broadway production of Equus, will fly back from New York to attend the memorial service.

A representative for Radcliffe was unavailable to comment as Wenn went to press.