A jury convicted Alvin Joseph Allen III, 23, of second-degree murder and illegal use of dangerous weapons for the death of 25-year-old Keandre Williams.
Carly Gregg, 15, was sentenced to life in prison without parole.
Danielle Dauphinais, 38, pleaded guilty to second-degree murder and two counts of witness tampering in connection with the death of her son, Elijah Lewis.
After a week-long trial, Mississippi teenager Carly Gregg has been found guilty of first degree murder, guilty of attempted murder and guilty of tampering with evidence.
