During the trial, Neuman's attorneys claimed that Neuman was visited by an angel whose voice sounded like that of Olivia Newton-John and a demon whose voice was similar to Barry White. While the demon encouraged Neuman to commit suicide, the angel allegedly told Neuman that Rusty Sneiderman's children were his and that he needed to protect them by killing Rusty Sneiderman.
Adriana Flores, a psychologist for the defense, testified last week that Neuman had suffered undiagnosed and untreated bipolar disorder with psychosis since his early teens. She also added that Neuman experienced delusions, and had erotomania, meaning that thought he was having an affair with Andrea Sneiderman.
If the jury finds Neuman not guilty by reason of insanity, DeKalb County Superior Court Judge Gregory Adams will decide when and if Neuman will be released.
ABC News' Christina Ng contributed to this report.