3.the only problem was that there were no witnesses to the murder.
However the police had recently started using fingerprinting in criminal cases
Only hours before his death
Hiller had painted some wood near his kitchen window
The police found some fingerprints in the wet paint
During the trial the police proved that the fingerprints belonged to jenning
And he was convicted of hiller murder
Since then fingerprinting has helped in the conviction of hundreds of thousands of criminals.