Sangwan Norsatokker, 45, told police that two men arrived at the plot of land about 1pm at Soi 10 Korkaew, in a white Fortuner. The plot is about three kilometres off Thepkasattri Road.
As the men talked to her husband, Echa Yala, 49, she heard her husband say: ''What happened today?'' Then one man went to the Fortuner, which had Bangkok plates, and brought back a gun.
The man shot her husband once in the head, then shot him twice more as he lay on the ground. The men walked without hurrying to the vehicle and drove off.
She said that a few days ago, three men - including a policeman in uniform and another in plain clothes - came to the plot of land to talk. Two days later, the men came to talk again.
She said her husband always maintained in conversations that the land belonged to him. She has told police the Bangkok number of the vehicle, which she remembered.
Her husband's body was taken to Vachira Phuket Hospital in Phuket City.