SAN DIEGO (AP) — It's wasn't hard for "Game of Thrones" to say goodbye to several characters at Comic-Con.

The panel for the fantasy HBO series kicked off Friday with an "in memoriam" segment set to Boyz II Men's "It's So Hard to Say Goodbye to Yesterday."

The tribute was dedicated to the scads of characters who've bit the dust on the show, from Khal Drogo to Catelyn Stark, who died in the infamous "Red Wedding" installment.

"Game of Thrones" cast members joined "A Song of Fire and Ice" mastermind George R.R. Martin and series co-creators David Benioff and D.B. Weiss for the talk.

Martin said he needed to work on the two upcoming novels, "The Winds of Winter" and "A Dream of Spring," because the show is catching up with the source material.