The body of an unidentified woman was found in a makeshift shelter under a u-turn overpass at the Lard Prao Intersection at 1 pm Sunday.
A forensic doctor of the Police Hospital said she might have died three of four days ago.
Her head was hit and she was stabbed five times. Her hands were tied.
Earlier, a Myanmar man has been arrested for allegedly murdering three homeless scavengers in Pathum Thani.