A GSK Korea sales manager in charge of consumer healthcare division jumped to his death off the company headquarters in Yongsan-dong, Seoul, on Thursday.

According to local reports, police arrived at the scene after someone reported that a man had jumped off the building. The sales manager, surnamed Song, had already died when the police arrived at the scene.

The reason behind Song’s death is still unknown and the police are investigating the incident based on CCTV recordings.

Medipana, an internet medical media outlet, reported that the police have also found Song’s suicide note.

“Based on the fact that Song left a suicide note, acquaintances of Song are worrying that he may have fallen to his death due to stress at work,” it said.