The killer, who ran a packaging business with her husband, is even believed to have donned a wig and disguise in order to get into her victim's home in Radnor, Penn., before Monday's murder-suicide.
At Tuesday's press conference, police cited an apparent motive for the murder-suicide was that Chapman had been having a relationship with Gerardot's husband, Mark Gerardot.
Chapman left her post at UD earlier this month to take a job as an assistant vice president at Villanova University.
Chapman until recently had been employed by the University of DE communications department, where Mark Geradot had recently been working as a creative director.
Police said Gerardot shot Chapman around 7 p.m. upon returning to her Radnor, Pennsylvania home Monday evening.
When questioned by the media, Police Superintendent William Colarulo said, "You had a man that was married that was having an affair with this other woman".
'The wife knew about it, and this was a calculated, planned attack'.
Police revealed the wife plotting "revenge" in a series of text messages and emails upon learning of her husband's affair with the younger woman.
'Her death was sudden and tragic, but will not define who she was to the thousands of people who loved her'.
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Upon reaching the house, Jennair waited for Chapman to come home and to confront her about the love affair with Mark.
"We understand that the circumstances of her death are the focus of news attention.but we have chosen to refrain from participating in these stories because they do not and can not capture the essence of her life".
A spokeswoman for Chapman family said they were "heartbroken and requests privacy and respect as they grieve". Investigators said the killings apparently stemmed from a domestic situation involving the two women and Gerardot's husband, Mark.
He went to the house and found police were already there.
Chapman, who was married to Newark City Councilman Luke Chapman, had just started working as a marketing manager at Villanova University. "The thoughts and prayers of the entire university community are with her family, friends and colleagues during this extremely hard time".
A former student remembered Chapman as a mentor and role model for her, while she was a student at the University of Delaware.
'While so much can be said about Meredith being a rising star in the Republican Party, this is a deeply personal loss for me. Meredith and Luke Chapman are close friends. When Chapman stepped inside her home that night, she was ambushed by Gerardot and shot in the head. "I simply can't imagine what he is going through".
But it also shocked the marketing, political and higher education worlds in the DE area, industries in which the Chapmans and Gerardots both found some prominence.