There was a family of three. A mom, dad, and a son. They lived in a circle house with a maid, a gardener, and a chef.

The mom and dad left for a vacation. When they came back they found their son, dead.

They asked the maid, gardener, and chef.

The chef was chopping meat. The gardener was digging a hole. And the maid was cleaning the corners.

Who did it?
(Re-read the riddle if you want and leave your answer in the comments)