They picked him up on a hunch months later after which he gave a voluntary DNA sample then decided to confess to the crime. Is that how murder investigations usually work? If so that one really fell into their lap. Or they were facing extreme pressure because a woman jogger was brutalized and murdered while out for a jog and the community was demanding justice and restoration of safety.
The level of resolution the jury sees is orders of magnitude higher than we can possibly have from a news article at 30,000 feet. Maybe the quality of the dna sample taken from the victim wasn't as consistent with the circumstances, while it still matched him. Maybe the confession happened at the end of a 13 hour video recording with one man sitting in a chair across from 2 and 3 interrogators at a time working in shifts until they finally got something they could call a confession. Jurors nowadays are well aware that there are many real life examples of this type of dishonest police work happening. And if it all wasn't on the up and up, why would you expect a jury to put a man away for life? It is innocent until proven guilty. Confession + DNA is normally an airtight case, but clearly there was something very, very loose about it for not one, but two jurors to be dubious of the proceedings of the investigation. But you, no, that article could have been two pictures and three words and you'd have come to the same conclusion - pretty girl, black male, confession and DNA.