The Louise Bell murder case: key points

THE LOUISE BELL MURDER CASE:

* Former maths and science teacher Dieter Pfennig, 68, has been jailed for at least 35 years for the murder of the Adelaide schoolgirl.

* The term has been added to his existing non-parole-period for another child murder, giving him a total minimum term of 60 years. He would be more than 100 years old should he become eligible for release.

* The disappearance of 10-year-old Louise Bell in 1983 has been one of SA's most high-profile and enduring cold cases.

* DNA evidence found on her pyjama top linked Pfennig to Louise in 2013.

* He chose not to give evidence in his own defence but maintains his innocence.

* Prosecutors said Pfennig admitted killing Louise to fellow inmates while in jail for murdering another child.

* Raymond Geesing was originally convicted of the murder but the decision was quashed on appeal.