Detroit 1-8-7 Season 1 Episode 5 (Detroit 1-8-7 s01e05) with title “Murder in Greektown/High School Confidential” aired on Tuesday, October 19th 2010 at 10:00 pm via ABC Network
Here is summary for Detroit 1-8-7 Season 1 Episode 5 :

When a teenage girl is killed at the same high school Lt. Mason’s daughter, Simone, attends, a chill runs through the precinct. The suspects include a lecherous construction worker with a record and even the victim’s boyfriend. Meanwhile, the 21-year-old son of a prominent defense attorney is murdered after hours in a Greek restaurant, and it looks to be an inside job.