The Memphis Fire Department arrived and found the body of Brandon Allen lying on the kitchen floor and the body of Regina Allen in the back bedroom. They were pronounced dead on the scene, officials said.
The couple had celebrated Regina's birthday four days ago.
Berryman admitted to killing both victims, taking their property, and setting their apartment on fire. Police said the suspect had an AR-15, loaded handgun, two jars of marijuana, three plastic bags of marijuana, three prescription pill bottles, and a bottle of charcoal lighter fluid in his possession at the time of his arrest.
Officials said eight to 16 apartment units were completely or partially burned out in the process. The total damage was estimated at $254,000 for buildings and $76,000 in its contents, police said.