New York State Police believe they've solved a 20-year-old cold case murder in the Hudson Valley that killed an NYPD detective's daughter.

Since 2003, New York State Police and the FBI have been investigating the murder of 20-year-old town of Wallkill resident Megan McDonald.

Wallkill Resident Murdered In 2003

McDonald, the daughter of an NYPD detective, was killed in 2003. Her body was found in a field in Wallkill, back in March of 2003.

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New York State Police have arrested Edward Holley for the murder of Megan McDonald

Holley was arrested with the help of DNA evidence, officials say.  Police add Holley had a "strong motive" to kill McDondald, but didn't go into more details during a press conference about the arrest.

New York State Police confirmed McDonald and Holley dated shortly before the murder. She just started dating someone new before she was killed.

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"I'm definitely not guilty," Holley said, according to NBC. "I loved her with all my heart...They’re framing me like some monkey, but it’s all good."

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New York State Police continue to ask anyone with information about this case to call New York State Police at 845-344-5300.

"The New York City Detective’s Endowment Association is offering a $10,000 reward for information that leads to the arrest of Megan’s killer," New York State Police stated in a press release. "The Federal Bureau of Investigation is also offering a separate $10,000 reward for information that leads to the arrest of Megan’s killer."

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