A millionaire's new trophy wife is killed during a family deer-hunting expedition, and Megan immediately suspects and accuses the husband, which leads him to use his influence to get Kate to pull her off the case. But he's not the only suspect—his ex-wife has motives, as do his grown children.
A young nanny is killed in a hit-and-run accident, and her 5-year-old charge, who requires medication, is kidnapped. Bud's interrogation of the prime suspect in the crime takes an unfortunate turn that puts him jeopardy.
A man who is presumed dead awakens on Ethan's examination table and walks off, which sends the team's investigation scrambling off in another direction. Megan's startling DNA discovery from the crime scene also throws things for a loop.
Peter rescues a woman from a house fire and forms an attachment to the case. Meanwhile, Megan clashes with a seasoned arson investigator (Terry Serpico), and her complaints about the situation lead to more uneasiness between her and Kate.
A famous equestrienne who ran a vocational program for prison inmates is murdered, and the prime suspect is a convicted felon and former drug addict (Crystal Bowersox). Meanwhile, Megan's ex-husband is upset to learn that she took Lacey to a crime scene, but Megan becomes equally peeved when she finds out that Lacey is being dragged along on her father's vacation with his new girlfriend.
A popular high-school student dies after a rave and unknown drugs are discovered in his system as well as multiple contusions on his body. Meanwhile, Megan reenters the dating pool, but her ex-husband delivers some shocking news to her and her daughter, ratcheting up the tension at home.
When a bride falls to her death on her wedding day, the list of suspects is as long as the guest list, and it includes a jilted ex-boyfriend and an overbearing father. Meanwhile, Ethan's interest in new member Dani is not reciprocated, as she may have her eye on someone else on the team.
A mother turns up dead after being acquitted of a crime in a high-profile trial and Megan and her team try to find her killer, but the investigation is hampered by a reporter looking for a sensational story.
It's a case of cold-blooded murder when the owner of an Italian-family restaurant is found dead in the freezer, and the team turns its attention to the immediate familia. Meanwhile, Det. Baker comes to grips with a haunted past.
The team's caseload doubles after a car accident reveals a dead body in a trunk, which in turn leads to another homicide victim. Meanwhile, Megan and a former acquaintance reconnect, and Kate's job is in jeopardy.
After the parents in an apparently happy family are murdered, the investigation uncovers some cracks in their seemingly perfect facade. Meanwhile, Curtis isn't adapting well to his new position; and Megan's new relationship intensifies.
Two young girls are in an auto accident, where one is critically injured and the other is pronounced dead. But Megan's team soon discovers that the victims' identities were mistaken, and the deceased may not have been killed in the crash.
Part 1 of 2. An act of terrorism unleashes an unknown virus that kills scores of people throughout the city. The Center for Disease Control takes over the investigation to determine what caused the outbreak and uncover who was responsible.