A 34-year-old Kershaw man will serve life in prison without the possibility of parole for killing a 15-year-old boy in Colleton County in July.

Shag Qu-Tee Marshall pleaded guilty Thursday to murder, attempted murder and possession of a weapon during the commission of violent crime.

He shot to death Calvin Fishburne Jr. and wounded Fishburne's 17-year-old brother, Quinton Simmons, July 19 in a rural mobile home park off Keegan Road.

Authorities said Marshall was romantically involved with the same woman as the boys' older brother and went to Colleton County to confront him.

Marshall stole a gun from his uncle, took a bus from Camden to Walterboro and then walked for miles to find his rival, according to prosecutors.

Marshall knocked on the door at the mobile home, and the teenage boys who answered assumed he was their brother's friend and offered him water, officials said.

Marshall took out a gun and shot Fishburne in the head then continued shooting, grazing the back of Simmons' neck.

Simmons ran to a neighbor's home, and the neighbor called 911 as the boy went back to check on his brother.

Colleton County sheriff's deputies set up a perimeter around the mobile home park, brought out dogs and a helicopter and found Marshall hiding in a nearby field.

They discovered a handgun nearby.

Fishburne died at Medical University Hospital the next day.

Prosecutors believe that Simmons survived the attack only because Marshall's gun contained old bullets that misfired.

"He was determined to kill, even if it wasn't his intended target," said 14th Circuit Solicitor Duffie Stone. "This senseless act of cold-blooded violence took an innocent 15-year-old boy from us. The man capable of such evil should -- and will -- live out his days in a prison cell."

Reach Allyson Bird at 937-5594 or on Twitter at @allysonjbird.