Just In: Dionne Warwick: A Heart Attack Killed Whitney Houston, I Believe

Dionne Warick has her own theory as to what killed her cousin, Whitney Houston.

“You know, in all honesty, I think she had a heart attack, that’s what I think happened to her,” Dionne tells ET, in an interview airing tonight.

When asked about possible drug use playing a role, she added, ” I don’t know if it’s that or not. I think her heart just gave out.”

Dionne also spoke about the emotional plane ride from California to New Jersey with Whitney’s body on board. “It was a combination of things, stories, laughter, tears. All the emotions that you feel when somebody very near to you passes.”