It looked like a routine homicide with traceable DNA and a witness that never lies.

However, this was a high profile murder and the stakes were equally high.

The Death Penalty was on the table.

This case would cast serious doubt over the validity of capital punishment.

It would question the infallibility of forensic evidence.

The political fall out would reach the White House.

What nobody realised was that someone had committed the perfect crime not by planning but by accident.