The 68-year-old has been found guilty of murdering Adelaide schoolgirl Louise Bell more than 30 years ago.
In delivering his verdict, Supreme Court Justice Michael David also urged Pfennig, 68, to reveal where Louise’s body is located “to bring this whole ghastly thing to an end”.
“That may or may not affect my sentencing,” he told the court in Adelaide as Pfennig stood in the dock.
Louise was abducted through her bedroom window in Hackham West in Adelaide’s south in January 1983. Her body has never been found.
Her disappearance sparked a police search of unprecedented scale in suburban Adelaide and it remained one of South Australia’s most enduring cold cases.
Pfennig was charged in 2013 after DNA scientists in the Netherlands linked him to Louise’s pyjama top, which was found after her death.
He is already serving a life sentence with a non-parole period of 38 years for murdering Murray Bridge boy Michael Black in 1989 and later abducting and raping a 13-year-old boy.
Justice David announced his guilty verdict to a packed public gallery full of family members, detectives and others.
Sentencing submissions will be heard on December 6.
