Officials announced an agent from South Korea's National Intelligence Service (NIS) was found dead on Sunday in his own car after an apparent suicide amid a hacking scandal.
The agent left a note refusing that his team had used spyware to wiretap the mobile phones and computers of South Korean citizens in a scandal regarding the spy agency.
The 46-year-old spy was found dead in his car of an apparent carbon monoxide poisoning, officials said.
Police released the note and confirmed that it was written by the intelligence agent, denying there was any spying against citizens or any relation to elections.
"I believe excessive zeal for work has created this situation," it said in the note.
Information about the agent’s identity in the intelligence service was not announced.
The hacking scandal case began after the spying agency announced it had purchased a spyware, intended to research or use against any foreign targets, but the spyware is from an Italian firm that used to spy on mobile phones and computer communications which brought about suspicions regarding the agency.
The agency struggles to clean its image of being a political tool of sitting presidents as the case is one of the series of scandals it is facing.