He died of a heart attack at LAX (Los Angeles International Airport) while on his way to his grandmother's 100th birthday.
The "Elementary" episode "Folie à Deux", which was the first of season 5, was dedicated to him. The end credits read "In Memory of Our Friend Eric Justen".
He was recently married in Maui, HI.
The "Better Call Saul" episode "Mabel" which was the first of Season Three was dedicated to him.