BBM. On the fb account he used to comment on her photos, he only has 27 friends and she is the only person that isn't a relative or someone from back home. He didn't make any effort to hide his association with her either. IMO if he was a serial killer, he'd likely be more careful.In turn, that's making me wonder if Ágnes is only one of a number of victims.
I would love some more information about the police investigation tbh.
Pure speculation and JMO.