The first victim was Kevin Lee, a property developer, landlord, and lover of Dennehy. The 48-year-old lived in Fletton, Peterborough, with his wife Christina and their two children. Lee later employed Dennehy as a decorator. Before his death, he confessed to his wife that he was having an affair with Dennehy which he promised to end.
The second victim was a Polish national named Lukasz Slaboszewski who met Dennehy through their shared habits of drinking and drugs. He believed that Dennehy was his girlfriend. She lured him to a property with suggestive texts, then stabbed him through the heart. Dennehy stored his body in a bin for several days before dumping it in a ditch.
The last victim was John Chapman, a 56-year-old housemate of Dennehy. Dennehy used a pocket knife to stab him once in the neck, killing him.
Slaboszewski was killed at some point between March 19 and 29, 2013, and the two other men were killed on March 29.