NEW ORLEANS (AP) — Authorities have dropped charges against a suspect in the 2016 cold case slaying of a 25-year-old Tulane University graduate who was visiting New Orleans to plan his wedding.

“Serious issues” with a critical witness’s availability arose and led the Orleans Parish District Attorney’s Office to ask on Tuesday that charges be dismissed against Ernest Weatherspoon, the DA said, without elaborating, in a news release.

Thomas Rolfes, of St. Louis, had come back to the city on a Mother’s Day weekend to meet with his fiancée and scout wedding venues. He was found May 7, 2016, shot to death at an intersection after leaving a bar.

Weatherspoon, 46, was arrested and indicted in December 2021 by a special grand jury on one count each of armed robbery and second-degree murder.

District Attorney Jason Williams said his office has been in close contact with Rolfes’ family, who agreed that dismissal was the best course of action at this time.