Melt butter in a large heavy skillet over medium-high heat.
Add shrimp and garlic. Cook stirring constantly 3-5 minutes or until the shrimp turns. Remove shrimp leaving garlic butter in the skillet.
Add half and half to the skillet; bring to a boil stirring gently.
Reduce heat and simmer for 15 minutes, stirring occasionally.
Add shrimp, parsley, salt, pepper and dill weed. Stir until blended.
Serve over pasta.