Annika Peterson

When Joan revisits one of Sherlock's cold cases, she discovers an unsolved murder is connected to a rare prehistoric fossil. Meanwhile, Sherlock finds himself in uncharted territory when his duties as a sobriety sponsor cross his personal boundaries.

Charlie convinces Don to investigate a student’s suicide in order to make sure that it was not murder.

A baby boy's poisoning leads detectives to a baby food manufacturer, but the real culprit might be in the family. Poison is found in the nanny's room, leading to her arrest. During the trial, however, Kincaid and McCoy discover that the baby's older half-brother - jealous of the attention paid to the new baby - killed him. Patti Lupone (Life Goes On) guest stars.

The investigation into a drug heist offers brief glimpses into the private lives of the CSIs, whose nerves are on edge when they become suspects in the crime they're trying to solve.

Stella is a murder suspect when her DNA matches the evidence in a Philadelphia cold case. Mac's career is put in jeopardy. Stella is forced to deal with painful memories when Det. Valens (Danny Pino) visits the lab and says her DNA is connected to a Philadelphia cold case making her a suspect, and Mac's career is put in jeopardy when an internal investigation is opened against him. (TV-14)