Woman kills husband's mistress, herself: Police

Police said the killing shocked the tight-knit community in suburban Philadelphia.
1:29 | 04/25/18

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Transcript for Woman kills husband's mistress, herself: Police
I cannot like all of and on the streets just like. Prius cars ambulances all possible allies residents are still be living the gruesome discovery that your police say junior Garrett broke into marriage Chapman's Rosemont home. An English at 33 year old. Who's lying in wait and shutters and she walked and she shot herself. The carnage stemmed from a domestic situation involving both women and geared owes 49 year old husband mark. He knew something wasn't right when Chapman never showed for their date. Those bodies discovered in her kitchen. Investigators figured out disguised herself and took a train from Delaware to the home and then notified her husband this was a calculated planned attack. There were emails and text messages indicating which he planned to do Chatman was muted neighborhood but listen to Joseph believes she saw the 33 year old in her final moment. This Danish UN and probably less than five minutes. After she UN and I heard a noise that at the time like. I got a 2007 graduate from the University of Delaware Chapman worked for the school in media relations and was starting a new job. At Villanova University. She even ran unsuccessfully for state senate seat in Delaware and 26 TE. She might have been one of the smallest people in the room but she had one of the biggest and brightest personalities that. We never come across here it's University of Delaware. Violence has shattered the hearts of many people knew her and continues through fall asleep you mean people. I still can't believe all.

This transcript has been automatically generated and may not be 100% accurate.

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