VIENNA, Oct 2, 2008 (AFP) - Efforts to determine whether an alleged Croatian Nazi war criminal in Austria is fit for extraditition have been delayed anew by scheduling problems, the daily Kurier reported Thursday.

Swiss psychiatrist Marc Graf, who was to have examined 95-year-old Milivoj Asner, renounced the job because of an overloaded schedule, Norbert Jenny, court spokesman in the southern city of Klagenfurt, told the newspaper.

A colleague of Graf will be contacted instead.

The Swiss doctor was tapped in August to examine Asner -- who has been living in Klagenfurt since 2006 under a different name -- after four separate medical reports concluded he suffers from dementia and is not fit to be questioned.

As a result, efforts to extradite him to Croatia were dropped.

Nazi hunters have repeatedly questioned the findings, especially after pictures were published in the British newspaper The Sun showing Asner and his wife relaxing on a terrace among Euro 2008 football fans.

A new examination by an outside expert aims to prove the Austrian findings about his condition were in good faith.

The 'fourth most wanted Nazi' on the list of the Simon Wiesenthal Center, Asner is accused of having organised the deportation of Serbs, Jews and gypsies to Nazi concentration camps, where most of them died.

Asner has given a number of interviews in recent months in which he does appear to be lucid. In June, he told Austrian public television ORF he was ready to surrender to Croatian authorities.