Speaking with Dr. Phil for a two-part special interview, Gordon got candid about discovering his girlfriend, unconscious in a bathtub in her home in Atlanta, Georgia, and how similar the situation was to the death of Brown’s mother, Whitney Houston, three years earlier.
"It was literally a nightmare all over again," Gordon said.
Gordon admits to have used drugs with Brown "socially" while her mother was still alive, but revealed that Brown's drug use "got really bad" after Houston died: "At the time, that's kind of the only way we knew how to deal with what had happened."
"I ask him straight up, 'Did you murder Bobbi Kristina? Did you concoct a lethal cocktail that you gave her to end her life?'" he revealed on Tuesday. "There are accusations from this family that he in fact was involved in the death of Whitney and I ask him straight up, 'Did you murder Whitney Houston?'"
"We're going to hear the answers and people are going to be able to judge for themselves the credibility of his answers and explanations," Dr. Phil added.
As for Gordon's health, Dr. Phil said he thinks "the rehab has worked for him."
"You know, he looked the best I've ever seen him look," Dr. Phil shared. "He was bright-eyed, he was focused. He looked healthy."
Part one of Dr. Phil's no-holds-barred two-part interview with Gordon airs Thursday, April 28. Check here for local listings.
For more on Gordon's turbulent 2015 interview with Dr. Phil, check out the video below.