Blue Bloods (2010)

S04E09 Bad Blood

In "Bad Blood," Danny and Baez delve into a murder case where Baez's estranged brother, a recovering drug addict, emerges as the primary suspect. Meanwhile, Frank discovers that one of his top K9 officers, a decorated German Shepherd, faces allegations of excessive force. Concurrently, Henry looks into the widow of a deceased NYPD colleague, suspecting she may be involved in her husband's demise.