Under an immunity deal, a co-defendant in a murder trial took the stand late Tuesday.Stephanie Gardner, arrested in May 2015 on a count of party to the crime of felony murder, testified she had been with Arrick Deandrae Camps and Bernard Mario Dixon in Marietta on April 6, 2015. About 6 or 7 p.m. Gardner said she received a message through Facebook from Rebecca Dover about “a lick,” a term meaning to make money in a short amount of time usually through robbery.“She told me she had a lick, and then she changed it and said it wasn’t really a lick, it was an easy way to get money,” Gardner testified, adding Dover said it wasn’t “stupid or dangerous or something along that line.”Camps and Dixon are on trial on homicide charges in connection with the April 7, 2015, shooting death of Robert Ashley Carr. Carr, 36, was found face-down outside Woodright Industries off Highway 411 about 6:45 a.m. April 7. He had been shot multiple times at close range with a small-caliber handgun.Opening statements and testimony Tuesday painted a picture of drug use and prostitution, and pointed to robbery as a motive for Carr’s death. Defense attorneys maintain Camps and Dixon were not in the area long and no murder weapon has been recovered.In addition to Camps, Dixon and Gardner, two other people were arrested in the case — Elizabeth Morgan Kelley, who was charged with party to the crime of felony murder, and Dover, who was charged with felony murder.Gardner will open testimony in Judge Suzanne Smith’s courtroom A at 9 a.m. today.