Two killings in Sandy Springs and Cobb County this weekend are related and a suspect is in custody, according to the Sandy Springs Police Department.

Justin Hess, 31, was arrested by a SWAT team Dec. 18 at the scene of a fatal shooting in Marietta, according to Reporter Newspapers broadcast partner CBS46. He is being held on charges of felony murder and aggravated assault, and was denied bond at a Dec. 19 court hearing in Cobb County.

Justin Hess, 31, in a Cobb County Police booking photo. (CBS46)

Hess is accused of killing his mother, Carol Hess, at the Marietta townhouse on Dec. 17, then killing William E. Haynes, 53, at Extra Space Storage at 6780 Roswell Road in Sandy Springs. Haynes was found dead from “multiple stab wounds” on the floor of that business, according to Sandy Springs Police.

According to Sandy Springs Police, Carol Hess’s car was found at the Sandy Springs business, and Haynes’ car was found back at the scene of the Cobb County crime.

Sandy Springs Police are seeking a warrant to arrest Hess on a murder charge, the press release said.

CBS46 reported that anonymous neighbor of Justin Hess described him as “crazy.”

“I thought, ‘He’s crazy.’ You don’t know what crazy people might do,” the neighbor said. “My parents and I always knew there was something wrong with him, and everybody knew that, but everybody was afraid to do something about it. I saw him with a gun driving into the woods and I also saw him doing doing karate at the pool. It was kind of weird.”