MEMPHIS, Tenn. - A Tennessee Amber Alert has been issued for a 7-month-old Tennessee boy who is believed to have been taken by a suspect in a murder investigation.Officials say Barry Medlock is wanted by the Memphis Police Department a charge of second-degree murder.According to police, Medlock may also have his son, 7-month-old Braylen Hunter Clark, of who he does not have custody.The missing baby boy was last seen Sunday afternoon at around 1:30 in Memphis, Tennessee.Officials described the murder suspect as being around 6-feet-1-inch tall with a weight of 180 pounds.