(Photo: ASSOCIATED PRESSAP)

The doctor charged in Michael Jackson's death tells police detectives in an audio recording that he was treating the singer for sleep problems.

Dr. Conrad Murray tells detectives that the pop superstar was "not able to sleep naturally." Jurors are listening to the recording on the ninth day of Murray's involuntary manslaughter trial.

Murray is heard telling the police that he stayed at Jackson's home every night except for Sundays. He also details actions after the singer returned home from rehearsal for his comeback concerts.

Murray told the detectives that he rubbed skin cream on the singer's back and then gave him a small dose of the sedative lorazepam. The singer remained awake.

Murray then says he gave Jackson another sedative, Versed, but the singer was wide awake.