Australian singer Delta Goodrem has been forced to consult security experts after her fiance Brian McFadden was repeatedly threatened by an online stalker who calls himself ‘The Messiah’ over popular networking site, Twitter.

The man, believed to be Australian, goes under the Twitter alias Saviour Mankind, and has professed his “love and ownership” of Goodrem through countless messages on the site, some of which have been responded to by McFadden.

There are some who have suggested that by responding to the threatening remarks, McFadden has “egged on” the stalker rather than placating him, with Saviour Mankind’s Twitter posts quickly turning to darker topics like murder and rape.

On another website, Saviour Mankind has described himself as a “schizophrenic” who hears voices and is a “messiah” figure.

Jennifer Fontaine, a spokeswoman for Goodrem and McFadden, told News Limited: “We’re very much aware of this matter but we’ve been advised to not make any comment at this time. We have security looking at it.”

The longtime couple has threatened to obtain a restraining order against Saviour Mankind, after McFadden received the following letter from the stalker: