Yesterday, a judge released the 911 call that JENNIFER HUDSON'S sister Julia made when she found their mother dead.  Julia told the 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 added, "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."

Toward the end of the call, she's speaking to what we think is a neighbor.  She says,"Where's my brother?  What happened?  She's on the floor, I'm here by myself."

Listen to the call here:

Julia's estranged husband William Balfour is currently on trial for killing Julia and Jennifer's mom, their brother and Julia's 7-year-old son in October of 2008.