CLAYTON COUNTY – A Clayton county jury has convicted a man of voluntary manslaughter for killing his girlfriend’s mother. The weeklong trial for 23 year old Latoris Grovner ended Friday, when the jury convicted him of the lesser charge, instead of malice murder for the 2011 beating death of 49-year old Alena Marble. Prosecutors say Grovner and Marble’s daughter, Kajul Harvey, conspired together to carry out the crime, because Marble disapproved of her daughter’s relationship with Grovner. Investigators believe Harvey who was living with her mother in Riverdale at the time, specifically left a door open to the townhouse so Grovner could slip in and carry out the plan. But defense attorneys convinced a jury that conspiracy was never the plan, and that Grovner was surprised, when he entered the home, where Marble confronted and threatened him. They say he became enraged, and never planned to kill Marble. He could receive up to 20 years in prison, and will be eligible for parole. Harvey, who was 21 at the time, will be tried on felony murder charges at a later date.