I’ll take the second clue and try to stretch it as far as:

"William Herschel III, heir to the Herschel Paper Company", is... 
>! the original script (hence paper) of the eighth Quentin Tarantino movie, "Hateful Eight". The script was leaked online prior to the start of the filming, causing the movie to be initially "killed" by Tarantino.

"His body was found in fishing gear" — 
>!fishing gear is a "net", reference to the Internet, where the original script was leaked.

Another way to look at it, a murder of William Herschel III is...

>!A reference to "Kill Bill". There were already 2 parts of the movie and the 3rd one in the works, hence "III".

And the Paper Company is a...
>! reference to "Pulp Fiction"

"lake" and "Labrador" — 
>!reference to "Reservoir Dogs"

"Eight suspects, each had a grudge" — 
>!reference to "Hateful Eight"

"chain was not found" — 
>!reference to "Django Unchained"

"son of Mr. Herschel and an unknown maid" — 
>!i.e. a bastard, a nod to "Inglourious Basterds"

"CCTV footage proved that his death..."
>!a reference to "Death Proof"

"Jack, his personal flight attendant" — 
>!a reference to "Jackie Brown", whose heroine was a flight attendant.

"his death took place around 3pm the previous day" — 
>!basically he was lying dead "From Dusk Till Dawn".

The name of the puzzle, "Another Sensational Crime Fiction" — 
>!reference to "Pulp Fiction".

And the name "William Herschel" is...
>! also a name of a famous astronomer, which by a long shot could be a reference to the upcoming "Star Trek" by Tarantino.

Did I forget something?