George Williams, 27, was sentenced to the mandatory term immediately after a jury convicted him Wednesday of second-degree murder, conspiracy and a weapons violation, The Pottstown Mercury reported.
Prosecutors alleged that Williams and two other men kidnapped Derrick Ralston, 25, of Pottstown in October 2007 and took him to Philadelphia.
"They stood him on a street corner and stripped him naked," Assistant District Attorney Mike Barry said. "He begged for his life and told them he had a wife and kids."
Prosecutors alleged that Ralston then ran and the three pursued him, and he was shot seven times and left for dead.
"It was brutal. They humiliated him. They stripped him of all his dignity before killing him," Barry said.
Another Philadelphia man, John Andrews, pleaded guilty to third-degree murder and was sentenced to 20 to 40 years in prison. Authorities said a third suspect was never charged because he was killed later in an unrelated shooting.
Williams did not testify but denied to police that he was involved in the killing.
Information from: The Mercury, http://www.pottsmerc.com