Police in Florida have arrested an Irish American woman suspected of killing the wife of her lover whilst dressed as a clown.

Police allege that Sheila Keen was having an affair with victim Marlene Warren’s husband and knocked on her door before shooting her dead.

Palm Beach cop Paige McCann told reporters, “The clown had two balloons as well as a bouquet of flowers and went to hand Marlene those items. And as she went to receive those items, she commented: ‘How nice.’

“It was at that time the clown pulled out a gun and shot Marlene in the face.”

Police say Sheila Keen Warren dressed as clown in 1990, shot Florida woman, & later married her husband. DNA now leads to cold case arrest. pic.twitter.com/bmxKW919nU

— Darla Miles (@DarlaMiles7) September 27, 2017

Keen and Marlene's widower, Michael Warren, were questioned by police but, despite establishing that Keen had previously worn clown costumes in public, the case left them flummoxed.

Filed away for over 20 years it was reopened three years ago and now, with help from new DNA technology and painstaking crime scene reenactments, police concluded there was enough evidence to link Keen to the crime.  

New video of the arrest of Sheila Keen Warren, suspect in the killer clown case. https://t.co/aM7MIuMUkj pic.twitter.com/G9aAgfcQYb

— WPEC CBS12 News (@CBS12) September 28, 2017

“In cold cases, we have a big puzzle,” McCann explained.

“Some of the pieces are already filled in. A lot was already filled in by the thorough investigation done by the initial detectives and we just needed a few little pieces.

“We were able to do that with new technologies and DNA. We were able to complete the puzzle and that led to the indictment.”

Read more: In brutal crime, Irish woman murdered her fiancé police say

The 54 year old was arrested in Virginia on Tuesday where she and Michael Warren, who she married in 2002, have been living since their wedding.

No charges have been filed against Warren, but McCann declined to say he was in the clear and added that, “the case is still ongoing”.

Keen will be extradited to Florida where, if convicted, she faces life imprisonment or even the death penalty.

Only in Florida. 😔
Woman arrested in 27-year-old Florida killer clown case https://t.co/E02wHuaRCn

— Q Explains it All (@_Q_the_Great) September 29, 2017

H/T: Irish Times