The 42-year-old Argentine has led the team to four wins in four games since taking over as interim manager in place of sacked former Spain coach Julen Lopetegui two weeks ago.
Following the news of the death of Marvel legend Stan Lee on Monday, fans and celebrities from around the world are expressing their condolences on social media.
A senior Turkish journalist involved in the investigation said that an audio recording from the Saudi consulate in Istanbul is available, in which the journalist's last words can be heard