Jury to weigh killer's claim of voices from 'alter-ego'

A man who pleaded guilty to manslaughter but not of murder told court he was delusional at the time. (Dave Hunt/AAP PHOTOS)

An aspiring rapper who bashed a sleeping man to death was in a state of "psychotic delusion" heightened by months of drug use, a court has been told.

Coskun Jaques Marius, 30, in November pleaded guilty in Brisbane Supreme Court to the manslaughter of Tane Tahi Manawa, 38, at the victim's Surfers Paradise home on May 10, 2019.