During sentencing on Wednesday, Judge Geraldine Borchers said she recognised that Jacques Terblanche was a tik addict, but said not all addicts committed violent crime,Beeld reported on Thursday.
The murder weapon, an iron bar from a hand weight, was used to inflict injuries.
Terblanche was also sentenced to 15 years for robbery with aggravating circumstances, to run concurrently with the murder sentence.
Craig Thomas, a paramedic from Kempton Park who had a relationship with Mischke, was sentenced to 20 years in prison last year after he accepted a plea agreement.
The two were tik addicts who attacked and robbed Mischke for drug money.
Thomas said it was Terblanche who beat a sleeping Mischke to death.
Terblanche had denied this.