Witnesses said the attack was carried out by two men on a motorcycle and two other groups of people in cars, the Dominican Republic's chief prosecutor Jean Alain Rodríguez told reporters.
Tiffany Ortiz said in a statement issued by the team on Wednesday that her husband was in the intensive care unit at Massachusetts General Hospital under the direction of trauma surgeon Dr. David King.
Ortiz arrived in Boston on Monday night after getting an air ambulance out of the D.R. He was transported out on an air ambulance and taken to Massachusetts General Hospital via police escort.
EDITOR'S NOTE: This article has been updated to reflect the amount of money allegedly offered for the shooting.
Local authorities also announced that the alleged gunman - 25-year-old Rolfy Ferreyra Cruz - is now in custody as well.
Prosecutors also said the two men were seen on security camera footage talking with other people in the Accent and in a Hyundai in a nearby street before the shooting at a popular Santo Domingo bar Sunday night.
Tiffany Ortiz asked for privacy "while David continues to heal". "We guarantee to all Dominicans and to the world that justice will be done". Surveillance video from the night club identified Garcia as the assailant and shows him walk up behind Ortiz at the club while the 43-year-old former World Series MVP was in the middle of a conversation with another man and shoot him in the back.
Ortiz is recovering from a gunshot wound he suffered Sunday night in the Dominican Republic.
The driver of the motorcycle, Eddy Vladimir Feliz Garcia, was apprehended and beaten by bystanders after the motorcycle faltered.
The Dominican newspaper Diario Libre reported on Wednesday that Mirabal Acosta has been connected with a gang of drug dealers and assassins in Santo Domingo Este.
The officials declined to speculate about possible motives behind the shooting, other than to rule out a robbery attempt, but they said the alleged coordinator behind the attack was among those arrested, and that the group was paid 400,000 Dominican pesos, or about $7,800 dollars, to carry it out.