What caused the death of Albert Einstein?

Could you please elaborate on the circumstances surrounding the death of Albert Einstein? Was it a natural occurrence, or was there some other factor at play? What specific health issues had he been facing prior to his passing, and how did they ultimately contribute to his demise? Additionally, did any external factors, such as his lifestyle or environmental conditions, play a role in his untimely end? Understanding the full picture of Einstein's final days and what led to his passing would be greatly appreciated.