Who's the Killer?

Is one of these players Stuart's killer in the Murder Mystery?
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Gang Gathers Around the Body

The gang gathers around Stuart's body during the Murder Mystery party.
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Stuart Dies in the Murder Mystery Game

The gang finds Stuart dead in the middle of the room and must solve his murder.
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Raj Hosts a Murder Mystery Party

Raj talks to his friends about the Murder Mystery Party.
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War Game Night

Raj hands Howard something during the game night with Sheldon and Leonard.
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Penny Talks to Leonard and Sheldon

Penny surprises both Leonard and Sheldon with her comment.
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Hallway Chat

Penny and Leonard chat in front of the still-broken elevator.
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Penny and Leonard Discuss Movie Role

Penny talks to Leonard about an embarrassing movie role she's offered.
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Leonard and Penny Shop for a Table

Leonard buys a dining room table for the apartment.
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Leonard and Sheldon Have Discussion

Will Sheldon or Leonard win this one on "The Table Polarization"?
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Leonard Talks to Sheldon

Leonard talks to Sheldon while he's working on "The Table Polarization."
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Crowded Dinner Around the Coffee Table

The Bigi Bang Theory crew crowd around the coffee table for dinner.
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TBBT Quotes

Oh, Bernadette, please play my clarinet.

Raj's poem

Sheldon: I'll have a diet Coke.
Penny: Can you please order a cocktail? I need to practice mixing drinks.
Sheldon: Fine... I'll have a virgin Cuba Libre.
Penny: That's... rum and Coke without the rum.
Sheldon: Yes, and would you make it diet?