A former Detroit police lieutenant whose job was investigating dirty cops was sentenced to two and a half years in federal prison Tuesday for his role in a wide-ranging towing scandal. John F. Kennedy, 57, of Rochester Hills, pocketed nearly $15,000 in cash, cars, and auto repairs from an FBI informant between October 2018 and March 2021, according to federal prosecutors. Kennedy conspired with former cop Daniel Vickers, 54, of Livonia, to accept bribes from an unidentified towing company.