The police department is compromised from the inside by an intern who uses his access to stalk and manipulate the lead detectives. Other Possible References
Season 2, Episode 10 is titled "No Weddings and a Funeral," but it is often discussed in the context of "Love and Death" due to the death of a major character's father. [S2E10] The Hour of Death
An episode in Season 2 featuring Morgan Freeman discusses experimental models for human death . The police department is compromised from the inside