Morgan saluted his “brilliant and ferociously loyal” manager on Twitter.
“RIP John Ferriter, 59. My brilliant manager and ferociously loyal, kind, charismatic & supremely talented friend. I trusted him with my life, and he enriched my life so much.
“Thank you John, for everything you did for me, and for my family.”
His Good Morning Britain co-host Susanna Reid added: “So sad. I knew John briefly but long enough to know he was loyal, determined and great company. Devastating news.
“Hard to believe. Huge love to all of John’s family and friends.”