Anayet Hussain Bhati, Died Naturally or Killed by His SONs

Anayet Hussain Bhati, a big name in Pakistan show Biz died a few days back. He had heart attack and His whole body was paralyzed before death.
I have heard Anayet Hussain Bhati only in a few of religion gatherings. After he stopped working in the Show Biz, he became one of the famous Shia Zakirs.
There are News that He was too upset because of the attitude of His two sons. Some people say that He was shocked by the behavior of his sons had towards him during the last days.
I have been in Canada for the last 10 Years and did not have much contact with my buddies in Pakistan.
Is it true that he died because of shocking behavior of his sons?