The complaint states that Diaz-Chavarria willingly and maliciously attacked Williams while handcuffed, and that Williams has suffered "physical injury, physical pain and suffering, and extreme and enduring mental anguish" as a result.
"No police officer can hit a person while they're in handcuffs," Bell said.
Williams and his attorney are seeking $2 million in compensatory damages from the defendants, and $1 million in punitive damages from Diaz-Chavarria. Williams has also requested a trial by jury.
"We can't wait to get (Diaz-Chavarria) in front of a jury," Bell said.
A portion of the incident, which occurred at 2 a.m. on Sunday, Aug. 5 outside Laurel Station Bar and Grill on Route 1, was caught on video by a witness' cell phone camera.