Pol Capt Weerayut Kangkala, deputy inspector of Laem Chabang police, said a cleaning woman found the badly decomposed body of Sunee Charoensilp, 48, lying on the floor of her third-floor apartment.
The maid had noticed a foul odour and used a spare key to unlock the room.
She said she last spoke to Sunee on April 1 and hadn’t seen her come out of her room since.
Weerayut said an autopsy was being conducted.