LINCOLN, Neb. (AP) – One of the three teenagers who robbed and fatally beat a 49-year-old Lincoln man in a park has been given 20 years in prison. Eighteen-year-old David Centamore originally was charged with murder for the slaying in May. He made a deal with prosecutors and in September pleaded guilty to robbery and manslaughter. Court records say he was sentenced on Monday to 20 years for the robbery and 10 years for manslaughter, to be served at the same time. Centamore’s two accomplices, Johnnie Showalter and Jonathan Gollin, also were prosecuted as adults. Both were given 10-to-20 years in prison. Authorities say all three were 17 at the time of the crime.