Police believe that Jennair Gerardot, 47, broke into Chapman's home, waited for her to walk through the front door, and shot her.
Former University of DE communications official Meredith Chapman died Monday in what Pennsylvania law enforcement officers say was a murder-suicide.
Police said they believe Mark Gerardot was in the area because he had planned to meet Chapman for dinner, and when she didn't arrive, he became concerned and went to her house.
Meredith Chapman's death follows her recently moving to her new three story home following her departure at the University of DE where her love interest continued to work.
Meredith Chapman was just hired at Villanova as assistant vice president of marketing and creative services, and recently moved into the Delaware County neighborhood. Police also noted that it appears Jennair Gerardot brought a bag containing a wig and clothing with her. Jennair Gerardot didn't drive to Chapman's home and it wasn't immediately clear how she got there, police said.
Superintendent Colarulo said: 'You had a man who was married who was having an affair with this other woman.
Police added the murder suicide is alleged to resulted as a outcome of a meticulously planned execution.
Detectives say the murder-suicide was a "thought-out plan", with a 911 call recording revealing that the person who called said 'there's blood everywhere'.
Jennair Gerardot's husband, Mark Gerardot, was in the driveway when officers arrived.
'Her death was sudden and tragic, but will not define who she was to the thousands of people who loved her'. In 2016, Chapman ran against state Sen. "She was bound for great things and it's tragic for that light to go out so soon." said Sokola in his statement.
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Chapman, a 2007 graduate of the University of DE, worked for the school in media relations and marketing and ran unsuccessfully for a state Senate seat in DE in 2016.
Luke Chapman and Meredith Chapman's family also issued a joint statement Wednesday asking for privacy as they mourn.
"Villanova University was informed last night about the death of Meredith Chapman", said Jonathan Gust, a Villanova University spokesman.
'The thoughts and prayers of the entire University community are with her family, friends and colleagues during this extremely hard time'.
Chapman grew up in Beech Hill, Del., and graduated from the University of DE with a bachelor's in communications.
"I am shocked and devastated by the news", said Emily Taylor, executive director of the Delaware Republican Party. 'She wore a wig, and took a train from DE to Radnor.
'Just a week on the job and I'm already feeling the love from #NovaNation!
"In the hours since receiving the news, it has been impossible for me to imagine our DE without someone so transcendent and committed to service", he said.
Chapman and Mark Gerardot worked together at UD since the fall when the Gerardots relocated to Delaware. Jennair found a job at CIRCOR Instrumentation, a manufacturing facility headquartered in Spartanburg, South Carolina, according to her LinkedIn profile.