Authorities have arrested Kedarius Hamer, 20, and Nakero Hamer, 17, both of 102 Elmview Street; Thomas J. Hamer, 17, of 725 Sugar Hill Loop, Bolivar, Tenn., and Terrenz Mason, 21, of 2347 Hardaway Church Road, Michigan City.
The Hamers have been charged with two counts of first degree murder each.
Mason has been charged with accessory after the fact of first degree murder.
The arrests came after Paul Joel Koster and Ayla Roxanne Hopper were found dead in their home, located at 231 County Road 303, in Walnut, at about 4:30 a.m. Thursday, July 6.
The Hamers are being held without bond, Mason is being held on $20,000 bond.
All four are being held in the Tippah County Jail.