A Lincoln-Lemington man who has been on both ends of a pistol over the past 14 years was killed early yesterday during an apparent home invasion in Homewood. Ronnell E. Pittman, 32, was hit in the chest in a shoot-out around 2:40 a.m. after he entered a residence in the 1500 block of North Murtland Avenue, Pittsburgh homicide detectives said. Police said the trouble began around 2:30 a.m. when Mr. Pittman entered the Murtland Avenue home uninvited. The occupants ordered him to leave, but he returned a short time later with a semiautomatic pistol and began shooting at Mr. Hill,...