The 77-year-old newsman, who left the network in December, previously suggested that Morgan had been "oversold" to viewers prior to his January debut.
The British TV host later confronted King during a Piers Morgan Tonight interview and admitted that he'd been hurt by his predecessor's criticism.
While appearing on Access Hollywood Live, King insisted that he still struggles to watch Morgan's nightly telecasts.
"It's like watching your mother-in-law go over a cliff in your new Bentley... the agony and the ecstasy," he said.
King went on to insist that he misses covering breaking news far more than interviewing celebrities.
"There are days when you have a terrible thing, like Japan happening, Libya, the events in Egypt - you want to be there," he said. "The Kardashians, you could miss that one."
Morgan previously described King's criticism about his interview style as "disingenuous".
Piers Morgan Tonight airs weeknights at 9pm ET on CNN and at 8pm GMT on CNN International.