Amateur, not a professional hit: (i) used a semiautomatic instead of a revolver to avoid spent casings; (ii) used a silencer; (iii) fired from too far away, instead of point blank in the head; (iv) gun jammed, not prepared or used properly; (v) ended up on too many surveillance cameras, including at Starbucks; (vi) loitered too long outside the victim’s hotel.
https://www.dailymail.co.uk/news/article-14160185/assassin-chilling-words-bullets-Manhattan-CEO.html
No, used subsonic ammo that did not cycle the mechanism, as he was expecting, then he smoothly cycled manually.
The early details revealed that clearly the shooter was neither smart nor professional.
It was personal.
https://freerepublic.com/focus/news/4282397/posts?page=24#24