London (CNN) -- The extradition of honeymoon killing suspect Shrien Dewani to South Africa was temporarily halted Friday on mental health grounds, the High Court in London said.

CNN: UK court halts extradition of honeymoon killing suspect

Three years have passed since four men accused of the serial killing of six Roma people, on ethnic grounds, were arrested.

BBC: Hungary's rawest nerve: Learning to love the Roma

He identified 28 in which parents convicted of killing their children may have had grounds for appeal on the basis that prosecutors had relied on flawed evidence from an expert witness.

BBC: DNA doubt cast over other murders