Was one of the FBI special agents killed in Florida the "top investigator for Hunter Biden's laptop"? No, there is no evidence that claim is true. Special Agent Daniel Alfin was killed on February 2, 2021, as he attempted to serve a court-ordered federal search warrant for a violent crimes against children investigation. There is no evidence that he was working on a purported investigation into a laptop allegedly belonging to Hunter Biden that was allegedly abandoned at a repair shop in Delaware. FBI Miami Special Agent in Charge George Piro noted in a press conference that Alfin "has been assigned to FBI Miami since 2017 and has worked crimes against children violations for over six years."

The claim appeared as a post (archived here) published on Facebook on February 2, 2021 by Robert Heim. It opened:

GUESS WHAT????

Guess who was the top investigator for Hunter Biden's laptop?

His name is Special Agent Daniel Alfin.

This is what the post looked like on Facebook at the time of writing: