The Dreamgirls star's mother, brother and nephew were killed four years ago. A murder trial in relation to the deaths is currently taking place.
The content of the call was made public this morning (April 30) on the ruling of Judge Charles Burns, and against the wishes of the prosecution.
Jennifer's sister Julia Hudson is heard saying to the 911 operator: "Help, please. Oh, God. Somebody's killed my mother, somebody's killed my mother... Please help me. Oh my God, oh my God."
She was then asked if she needed an ambulance, to which she replied: "I don't know. I'm scared... Please... Please... Can you please send an ambulance, please. Oh my God.
"She's on the floor and I see blood coming from her head... I just came home from work and there's a bullet hole in our front door... She's 57 years old. Please help my mama. Please just send an ambulance."
Towards the end of the harrowing call, Julia can be heard saying to someone in the same room as her: "Where's my brother? What happened? She's on the floor... I'm here by myself."
Jennifer Hudson recently broke down in tears while testifying in the trial.