You know the type. High security, weeks or months of stakeout, sniper three blocks away…
The hitman sorta things I recall from the news are either planned and executed by national intelligence agents or some savage gunning and running from hired brutes, but never the variant with sophistication and private sector.
I’m sure there are, but if done right nobody would know (at least not national news). If done right the local law enforcement wouldn’t have much to go off of either.
Regarding the other type, there’s a podcast called I Spy where intelligence agents talk about missions, one of them was a Mossad assassination but it went wrong in the last moment. I haven’t heard others that I remember yet.