Rusalan Do, 29, a resident of Moo 1 in Rangae district, was shot four times, in the torso, right thigh and right arm.
His motorcycle was found behind a warehouse 200 metres from the scene on Sai Thong Road.
Thavorn Rattichote, who runs a nearby coffeeshop, told police he heard gunshots and then saw Ruslan running towards his cafe, collapsing out front.