If you were referring to a different "[S2E10] The Hour of Death," there are a few other possibilities, though Grimm is the most prominent:
The killer is revealed to be Ryan Smulson , the seemingly clumsy and eager police intern. [S2E10] The Hour of Death
An episode in Season 2 featuring Morgan Freeman discusses experimental models for human death . If you were referring to a different "[S2E10]
Analyze Ryan's psychological state. He is a Wesen who wants so desperately to be a "heroic" Grimm that he becomes a monster to his own people. He is a Wesen who wants so desperately
An episode in Season 2 titled "Signed in Blood" focuses on handwriting analysis to uncover premeditation in death cases. Grimm season 2 episode 10 review: The Hour Of Death
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