#7. The Smith Family

#7. The Smith Family:

The Smith family is a very wealthy family that lives in a big, circular home. One morning, Mr. Smith woke up and found his gardener's body. He knew it was one of his employees who had killed him. So he asked them what they were doing in the morning and he got these replies.

Driver: "I was outside washing the car."
Maid: "I was dusting the corners of the house." 
Cook: "I was starting to make lunch for later." 
From the replies he knew who the killer was. Can you guess who it was?

Did you solve the riddle?!