The eldest son of fugitive ferry owner Yoo Byung-eon never once set foot outside a small flat south of Seoul the entire time he spent hiding from police.
Yoo Dae-gyun (44) was finally arrested on Friday after more that three months on the run, just four days after forensics identified his father's corpse.
Prosecutors quoted him as saying he was unable to leave the flat because of the CCTV in front of the door.
A CCTV camera was installed just above the front door of the flat, where Yoo was hiding with Park Soo-kyung (34), the daughter of a senior member of the elder Yoo's crackpot cult.
Police checked the last seven days worth of footage and found that the door of the flat never opened during that time. Some media reported that the younger Yoo had ordered fried chicken to be delivered to the flat a day before his arrest, but a police spokesman said the CCTV footage shows no such delivery was made.
Kim Sang-shik, who led the police squad that arrested the Yoo, said, "We looked at the entire weeklong CCTV footage in the camera and found that the door knob didn't move once." But Kim added the camera is motion-activated and there is a chance that it failed to detect some movements.
Statistically, motion-activated CCTV cameras fail two out of 10 times.
A police officer said investigators did not expect Yoo to order takeaway food since he prefers organic meals.
Cho Eun-soo of the Incheon police said the flat did not have a landline, and Yoo did not use a mobile phone to avoid being detected.
"If any food was delivered, it must have been ordered by another person, but our investigation hasn’t found any proof to support that," Cho said.