Was he at home talking to his mother on the phone or at the scene of a crime? Jon-Adrian Velazquez, convicted of murdering a retired NYPD officer in 1998, is serving 25 years to life in Sing Sing Correctional Facility. But a 10-year Dateline investigation revisits the crime and his case in the report 'Conviction' airing Sunday, February 12, at 7pm/6c.Feb. 11, 2012