First, from Asia News: Archbishop of Smyrna: The martyrdom of bishop Padovese want the truth and not "pious lies" by Bernardo Cervellera
This article is badly translated into English, so I won't quote from it extensively. But from what I gather, the Latin archbishop of Smyrna/Izmir is familiar with the murder Murat Altun and thinks that the murder was one of political motivation rather than religious. The Islamic elements of the crime are mere red herrings to throw off the investigation and confuse the public. Archbishop Franceschini completely discounts in the interview what he sees as the lies regarding Murat Altun's alleged depressed state. I'll throw this out there from the summary at the beginning of the article:
Mgr Franceschini hypothesizes that the assassination was planned with precision, the killer for well trained, and the authors aim to destabilize the country and distance Turkey from Europe.
That would seem to go with what I have read about Murat Altun's alleged involvement with the organization known as the "deep state". Al Jazeera has a timeline.