14. Major Case

Low level drug dealer Grace Purefoy ( Lauren Campbell ) is helped to escape her violent supplier, Justin Lennox ( Stivi Paskoski ), by a neighbor who then kills her after she rejects his advances. When her body is found in a dumpster the next morning with the wallet of the daughter of a wealthy family Major Case is called in. Nichols and the heavily pregnant Wheeler arrive to investigate but when Wheeler goes into labor, Eames joins Nichols. They visit an old friend of Nichols, the highly respected forensic scientist Dr. Henry Muller ( Dylan Baker ) for assistance who happens to be Purefoy's neighbor and murderer.

Muller plants DNA evidence to link Lennox to Purefoy, even though M.E. Elizabeth Rodgers found nothing in her thorough examination of the body which had been washed down with bleach. When Nichols finds that Muller's mother lived across the street from Purefoy, he suspects Muller is involved but he is then taken off the case by Captain Danny Ross under pressure from Muller. However as more evidence points to Muller, Ross assists Nichols in setting a trap to expose Muller's guilt. Also stars Allison Daugherty as Grace's alcoholic mother Karen Purefoy and John Wojda as her mother's boyfriend Nate Henrick. Last episode to feature Julianne Nicholson ( Detective Megan Wheeler ).