I don't believe there are any signs point to foul play in his death. He died of pulmonary cardiac arrest at the age of 84. Without knowing the rest of his medical history, this looks like it could be completely normal given his age and health. If other details come out then I think it could be considered, but until then this looks like natural causes.
As reported by the Los Angeles news media and the Associated Press (AP) 84-year old director Paul Mazursky died from pulmonary cardiac arrest at Cedars-Sinai Medical Center. Mazursky had a history of cardiac problems, as well as numerous other medical issues. Mazusky had been hospitalized several times in the past few years.
Paul Mazursky was 84 years old when he died, which is a good, long life by any standard. He was ill for some time leading up to his death, and natural causes would be expected. Even if he took steps to accelerate the process to end his suffering, I believe he still let nature take its course.
The filmmaker died of pulmonary cardiac arrest Monday at Cedars-Sinai Medical Center in Los Angeles, said Nancy Willen, Mazursky's spokeswoman.
As a talented writer, actor and producer as well as director, Mazursky racked up five Oscar nominations, mostly for writing such films as "Bob & Carol & Ted & Alice" and "Enemies, A Love Story." He also created memorable roles for the likes of Art Carney, Jill Clayburgh and Natalie Wood. Later in life, Mazursky acted in in such TV series as "The Sopranos," ''Curb Your Enthusiasm" and "Once and Again."
He was born Irwin Mazursky in 1930, in Brooklyn. During the Depression, the family lived on the small wages his father earned as a laborer for the federal Works Progress Administration. When Mazursky graduated from high school, he changed his name from Irwin, which had hated, to Paul.