FILE- This undated photo released by the Memphis Police Department shows Tremaine Wilbourn. Wilbourn, an ex-convict facing federal charges in the fatal shooting of a Tennessee police officer has changed his plea to guilty. Wilbourn had pleaded not guilty to charges filed in December 2015 in the killing of Memphis Police Officer Sean Bolton. Authorities said Wilbourn shot Bolton several times in August 2015 while Bolton was attempting to detain him. (Memphis Police Department via AP, File)
FILE - This undated file photo provided by the Memphis Police Department shows 7-week-old Aniston Walker of Memphis, Tenn. Police have suspended the search for Aniston who disappeared under suspicious circumstances in northeast Memphis, on Thursday, Jan. 9, 2014. Officers using cadaver dogs conducted a three-day search of the area near the home where the baby lived with her mother and two siblings, but they had no results. (AP Photo/Memphis Police Department, File)
This undated photo provided by the Memphis Police Department shows 7-week-old Aniston Walker of Memphis, Tenn. On Friday, Jan. 10, 2014, one day after the baby was reported missing, police have charged Andrea Walker, the baby's mother, with two counts of aggravated child abuse and two counts of aggravated neglect or endangerment. (AP Photo/Memphis Police Department)