Dixon was held for second-degree murder, which carries a mandatory sentence of life in prison without parole.
Both men also face charges including robbery, theft and conspiracy. They were denied bail.
Adams, owner of Johnny's Top Cat Club, on 5th Street near Ruscomb, had just walked a female patron to her car and was returning to his bar at 10:45 p.m., when Roll pointed a gun at him, according to police.
" 'I don't have anything! I don't have anything!' " Adams shouted, said a woman who testified yesterday.
Roll then shot Adams twice, rummaged through a pocket and ran off, said the woman, who admitted to being drunk and high that night.
The woman said that she was talking with a very high Dixon when Roll shot Adams. Dixon, she said, appeared shocked and ran off after the shooting.
Dixon's attorney, Brian McMonagle, said his client had no weapon and had not been involved in the shooting.
Assistant District Attorney Richard Sax, countered that the video showed that after Roll pulled his gun, Dixon circled behind Adams to prevent him from running.
"This was a setup and a plan," Sax said.
"The fact that he is blocking in the victim makes him part of the robbery," Sax added.
Roll and Dixon were looking for money to buy drugs, he told the court.
Daniel Rendine, Roll's attorney, questioned how a witness could have identified his client when the video showed that the shooter had a baseball cap pulled low on his forehead and shading his eyes.
Sax donned a Yankees cap borrowed from a spectator to show that he was still very much recognizable with the hat pulled over his face.
