A Sky News journalist accused of hacking into the emails of fake canoe death couple John and Anne Darwin will face no further action.
Gerard Tubb allegedly accessed their emails but the CPS said it was uncertain whether this had taken place in the UK, and prosecution would not be in the public interest.
Prosecutors also said that the public interest would outweigh any alleged criminal activity.
Sky News declined to comment.
Mr Darwin admitted faking his own death in March 2002 to allow his wife to make fraudulent insurance and pension claims.
The couple planned a new life in Panama, but were jailed in 2008 after jurors heard how they deceived the police, a coroner, financial institutions and even their family.
A teenager has been arrested in Newcastle over allegations that he hacked into websites and disrupted computer networks to illegally obtain information.
The 17-year-old was detained by police on Wednesday under the Computer Misuse Act 1990.
It's believed he's a member of a group called TeaMp0isoN (TeamPoison), which has claimed responsibility for more than 1,400 hacking offenses around the world.
A Met Police spokesman said: "Computer equipment has been seized and is undergoing a detailed forensic examination.
"Inquiries continue between the PCeU [Police Central eCrime Unit] and other relevant law enforcement agencies in this continuing and wide-ranging investigation."