A former German secret service agent, considered a reliable source by Nazi hunter Efraim Zuroff, has stated that Alois Brunner, previously top of the "Most Wanted Nazis" war criminal list - his name has now been removed from said list, died four years ago in Syria aged 98. More details within the links below:

Alois Brunner, most-wanted Nazi, died 'unrepentant' in Syria | The Times of Israel

BBC News - Nazi war criminal Alois Brunner 'died in Syria'