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Martin David Pietz,the man charged with killing his wife in 2006, pleaded not guilty in King County Superior Court this morning.

Pietz, who was long considered the key suspect in the strangulation of Nicole Pietz, of Lynnwood, was arrested last month outside his job in Kirkland and charged with second-degree murder.

DNA and cellphone records link him to the crime, police say.

The body of Nicole Pietz, 32, was found in Burien in February 2006 about a week after her husband, 34, reported her missing.

Pietz’s husband, who uses his middle name, David, has long denied any culpability in her death. He failed a polygraph shortly after she was killed, according to an affidavit of probable cause released after his arrest.

Family and friends of Nicole Pietz attended this morning’s arraignment wearingmatching paper cutouts in the shape of a heart.

“Everyone loves her. Everyone wants justice for her,” Gael Schneider, Nicole Pietz’s mother, said after the hearing.