Armed with new evidence and eyewitness statements, Baton Rouge police detectives drove to Parish Prison on Tuesday and arrested Stanley Grigsby in the June 2012 robbery and shooting death of Columbus F. Milligan III.

Grigsby, 32, has been arrested in a series of crimes in the Istrouma/Mohican-Prescott Crossover area, although convicted only twice. Police spokesman Cpl. L’Jean McKneely said Grigsby has “terrorized” that community for several years.

“Neighbors in that area were afraid of him,” McKneely said.

Grigsby, 7040 Jewel Drive, proclaimed his innocence Tuesday afternoon as he was being escorted to a squad car outside the East Baton Rouge Parish Violent Crimes Unit on Independence Boulevard in the standard orange Parish Prison jumpsuit, wrists and ankles shackled for the return trip to jail to be booked on one count of first-degree murder.

“I’m innocent,” he said.

Shortly before 9:10 p.m. June 29, 2012, officers responding to a call about shots fired at 4202 Mohican-Prescott Crossover found Milligan’s lifeless body in the back of the 30-unit apartment complex.

At the time, Milligan was living at 4260 Mohican St.

Police suspect Grigsby shot and killed Milligan, 37, during a robbery, McKneely said.

Milligan’s father, Columbus Milligan II, was shocked but overjoyed Tuesday at learning the news of Grigsby’s arrest.

“That’s amazing,” he said. “It’s a blessing.”

He said he never expected police to solve the homicide. Another son, Stephen Cordell Milligan, was shot and killed in 2000 in a case that remains unsolved.

Witnesses claiming to have information linking Grigsby to the shooting of Columbus Milligan III recently contacted homicide detective Zac Woodring, McKneely said.

Grigsby was already in jail, awaiting sentencing from a July conviction on attempted second-degree murder and possession of a firearm by a convicted felon in a January 2012 shooting.

In that shooting, which occurred in the same apartment complex where police said he shot Milligan, Grigsby shot a man eight times with a handgun, leaving the man in critical condition for several days, court records show. The victim eventually pulled through and identified Grigsby as his shooter.

In a 2009 case, Grigsby pleaded guilty to aggravated assault with a firearm in a plea agreement in which three attempted second-degree murder charges were dismissed, records show.

Attempted murder charges against Grigsby also were dismissed at least one other time, McKneely said, and police suspect Grigsby was involved, but never arrested, in a number of other shootings in the Istrouma/Mohican-Prescott area.