Murder Plot :by me, Leon

Maria and Shawn are alone at home.
Maria steals Tiffany's jewellery and hides them in her wardrobe.
She goes to the kitchen to prepare poison wine.
Tiffany comes home from shopping and goes back to her room.
Sees an open drawer and looks into it.
Finds pics with another woman.
Maria comes in with wine.
Maria runs out of house because she is scared.
Alex comes home and goes into the room.
Maria comes back to take stolen jewellery.
Alex and his wife starts to quarrel.
Maria hears them quarrel and knows that Tiffany is not dead.
Takes a knife and runs into room and stabs Tiffany.
Alex and Maria stuggles with knife.
Knife drops.
Maria takes lamp and knocks Alex.
Alex faints.
Maria beats tiffany with back of knife to hide evidence.
Maria is the MURDERER!