NEW IBERIA — Authorities arrested an 18-year-old man Wednesday in the fatal shooting of a 57-year-old man Tuesday, an Iberia Parish Sheriff’s Office spokesman said.

Joey J. Rogers was booked into the Iberia Parish Jail on one count of second-degree murder in the slaying of Robert James Butler Sr., Sheriff’s Office spokesman Capt. Ryan Turner said.

“At this point, he is pretty much our main suspect,” Turner said.

Detectives “have a pretty good idea” about the motive although Turner declined to elaborate further.

Rogers often visited Butler, a handicapped man with a prosthetic leg, Turner said. Rogers considered Butler to be a friend, Turner said.

Butler was shot multiple times in the chest shortly before 1 p.m. at his home in the 1200 block of Angie Street, authorities have said.

Turner stopped short of saying Rogers confessed to the killing, saying only that “he cooperated with detectives.”

Investigators determined Rogers called 911 to notify authorities about the shooting, and then left the home, returning only after authorities had arrived, Turner said.

“He described himself as being a witness and later on detectives determined that he was a suspect,” Turner said, adding that Rogers was detained for questioning late Tuesday.