As more details emerge about the group of young men who are believed to be responsible for the shooting, authorities believe two of the suspects are also wanted for crimes committed in the United States.
After announcing new arrests during a press conference Wednesday, Dominican police held up the suspected weapon used to shoot David Ortiz in the back.
The statement given to reporters lists the total number of subjects in custody as six and a suspect remains at large. He initially was thought to be the shooter by police.
Police Maj. Gen. Ney Aldrin Bautista Almonte said the coordinator of the shooting was offered 400,000 Dominican pesos, or about $7,800, to carry out the crime.
He helped Boston capture their first World Series title in 86 years in 2004, when he was the MVP of the American League Championship Series.
The alleged gunman and another suspect approached the Santo Domingo bar where the shooting occurred on a motorcycle, officials say, and were seen on security camera footage chatting with the others in cars before the attack.
Afterward, police conducted "an exhaustive investigation" and examined video surveillance that showed the shooter running toward the Hyundai and reuniting with the people inside the auto.
The retired Red Sox legend's son, D'Angelo Ortiz, said his father's condition is improving.
In addition to Ferreira-Cruz, authorities have also arrested Joel Rodriguez de la Cruz, Reynaldo Rodriguez Valenzuela and Eddy Vladimir Feliz Garcia.
The document also reveals ineptitude, saying the driver was captured after he skidded and fell off his bike as the pair tried to flee. Enraged onlookers captured Feliz Garcia and beat him bloody before handing him over to police.
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 arrests came as Ortiz, 43, recovered in a Boston hospital following a second round of surgery on Tuesday, according to his family, which said he was sitting up and had taken a few steps.
Deivi Solano, one of Féliz Garcia's attorneys, said his client is a motorcycle taxi driver and may have unwittingly driven the shooter, but he did not shoot Ortiz.
The statement continued, "To the unbelievable surgeons, medical team, and staff at the Abel González Clinic in the Dominican Republic, there are no words to express our gratitude for the awesome care you provided".