While looking into Luka's user name cutelittlenemo1 ... (he usually uses it with the alias Vladimir Romanov), I found this chilling post HERE where Luka posts to a forum called Chris's Crime Forum on Friday Aug. 12, 2011 

"Its alarming how many psychopaths are walking among us". 

He is responding to a forum about missing person Brandy Nicole Wilson. 

What I also find interesting is that someone (maybe Luka himself) responded to this chilling post the day before he was arrested in Berlin.