Almost but not quite

In case you're wondering, the University of Illinois journalism professor who led a highly publicized four-year investigation to unmask Deep Throat as someone other than Mark Felt, had this to say, according to USA Today:

In 2003, students at the University of Illinois concluded after a four-year project that former White House counsel Fred Fielding was most likely Deep Throat, a conclusion Fielding denied. Bill Gaines, the professor who directed the study, said Tuesday that "we have to accept" that they were wrong "because [Bob] Woodward says so, and he's the only person who really knows."

If you're curious, Scripps Howard News Service compiled a list of some other people who've been famously "exposed" as the legendary Watergate informant.