Age 5, my mother was murdered. She went for a walk by herself late one night when she had left me to stay with my grandparents. She met a tall, slender red-haired man who was very polite, and offered to walk with her for safety. They walked and talked together for a while, he walked her home to her front door, said goodnight, then pulled out a knife and stabbed her 14 times.
She survived for a couple of days afterward. I remember my grandparents taking me to see her. I remember seeing her in the hospital bed unconscious, with my grandparents explaining that she was covered in needle marks from doctors trying to make her better. I have since speculated/wondered why she was out that night, perhaps she was trying to get drugs, and the marks were from habitual drug use.
It would perfectly explain why she was in such a dangerous situation, and why she left me with her parents frequently enough that I have so few memories of her, and my emotional pain from losing her wasn't really significant until it was triggered again for me at the age of 19 when my grandparents gave me a box labeled "memories" and it contained a birthday card from my mother that I never received that read "I love you very much! - Mommy" and I just completely lost my shit. I had never really been sad about it until then.
I have previously described this event as "watching my mother die", although I have no recollection of seeing her actual death, with my memory being more about hearing the news of her passing and being unsurprised by it.
Age 5-7, I recall after my mother passed being forced to speak with several psychiatrists. I think I remember them being concerned that I didn't react more to the passing of my mom, but ultimately, I feel like I didn't know my mom. It was difficult for me to feel for her when she was gone because she had already been gone from my life. I remember my first day of school, and chasing my grandmother down the hall and clinging to her because I was afraid to be left at school without her.