Who Is The Killer?

Riddle: Everyone in the house was with the owner. Everyone in the house except the owner went outside. When everyone came back The owner was dead. The maid said: I was on break So I went to the beach. The chef said: I was helping the car driver get groceries. The gardener said: I was planting seeds outside. The car driver said he was getting groceries from the shop all alone. Who killed the owner?