Mrs Smith Was Killed on Sunday Evening

Can you solve this sycophants riddle.
Riddle: There were five people in the house at the time of the murder. The police asked them what they were doing at the time of Mrs Smith’s murder.

At the time of the murder, the chef was preparing dinner, Mr Smith was in the garden looking at the stars with his telescope, the gardener was pruning the trees, the maid was setting the dinner table, and lastly, the butler was in the wine cellar getting wine for the meal.

So, can you tell who killed Mrs. Smith based on where the five witnesses were at the time of her death?
Answer: Mrs Smith, as there are no stars in the evening.