Story highlights Someone disguised as a clown fatally shot Marlene Warren in 1990

Sheila Keen was arrested this week after 27 years

(CNN) Marlene Warren was finishing breakfast with her son and his friends on May 26, 1990, when a white Chrysler LeBaron pulled into the driveway of her home outside West Palm Beach, Florida.

Someone dressed as a clown emerged from the car carrying two balloons and a flower arrangement, authorities said.

When Warren answered the door, the clown handed her the gifts, according to detective Paige McCann of the Palm Beach County Sheriff's Office. "Warren said something like, 'How nice,'" McCann said.

The clown then pulled out a gun, shot Warren in the face, walked back to the car and calmly drove away.

Warren died two days later in a hospital.

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