This classic episode of “48 Hours" reports on the 1970 murders of U.S. Army Doctor Jeffrey MacDonald’s pregnant wife and two young daughters. MacDonald has maintained that a group of crazed, drug-fueled hippies broke into his apartment and murdered his wife Collette and daughters. It took the U.S. government nine years to make its case against him, but in 1979, a jury convicted MacDonald of three counts of first-degree murder, a conviction based entirely on circumstantial evidence. "48 Hours" correspondent Bill Lagattuta reports. This "48 Hours" episode last aired on 3/17/2007. Watch all-new episodes of “48 Hours” on Saturdays, and stream on demand on Paramount+.