When the wife and two children of Christopher Coleman were murdered, it didn't take long for police to suspect Coleman for the crimes. The potential motive, an affair. But questions remained: who sent those emails and letters, threatening Chris’s family? And who left the spray-painted writing on the wall at the disturbing scene of the crime? “48 Hours" Correspondent Maureen Maher reports. This classic "48 Hours" episode last aired on 7/19/2014. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.