What is john Lennons saddest event?

The saddest event in John Lennon's life was undoubtedly the tragic loss of his mother, Julia Lennon, in a car accident on July 15, 1958. John was only 17 years old at the time and the sudden and unexpected nature of her death left a profound and lasting impact on him. This tragic event is believed to have shaped Lennon's emotional vulnerability and may have influenced some of the heartfelt and emotional songs he wrote later in life.