Police said Daen Homraruen, 40, was shot three times and severely wounded at about 9.30pm in a stairwell of the apartment building on Thahan Road in Thanon Nakhon Chaisri subdistrict Indusit.
He was treated at Vachira Phayabal Hospital.
Daen’s brother-in-law, Paramet Lekthimthong, 33, lives with Daen.
Paramet alleged Sergeant Anudul Sukkho, 33, drove his pickup truck to the building and when he saw him sitting outside the building he started shooting at him.
Paramet said when Dean emerged in the stairwell Anudul shot him and left.
Paramet said Daen and Anudul had had a dispute as their wives have vending stalls next to each other at a market and often quarrel.