COLUMBUS, Ohio – Columbus police, using “CSI”-style techniques, linked an injured man to a West Side holdup where a father shielded his infant son from an armed robber, then shot the suspect.

James Thompson, 44, was charged with aggravated robbery and receiving stolen property after he was released from Mt. Carmel West Hospital where he was recovering from a gunshot wound police say he suffered on Jan. 7 when he allegedly tried to rob Kelby Smith in the driveway of a relative of Smith’s on Crescent Drive.

DNA from blood at the scene of the crime matched Thompson’s, robbery squad detectives said.

Police say Smith was taking his two-month-old son out of his car in his infant car seat around 8:45 p.m. on Jan. 7 when Thompson allegedly approached him, brandishing a pistol.

While Smith shielded his son, Thompson put the barrel of the gun to Smith’s head and demanded money, police said.

SAs he was fleeing, Thompson turned and pointed his pistol at Smith, who pulled a gun of his own and fired, detectives said.

Police say Smith has a permit to carry a concealed weapon.