The Foxborough Police Department tells TMZ Sports ... it has submitted criminal complaints to prosecutors seeking assault and battery and disorderly conduct charges against a trio of Rhode Island men.
While cops did not reveal the names of the men nor any further details of the evidence ... they did say they believe the men were somehow involved in the altercation that resulted in Dale Mooney's death at the Pats vs. Dolphins game at Gillette Stadium.
Tragedy: A longtime #Patriots fan died at the game Sunday night after being punched by a #Dolphins fan and hitting his head on the ground, causing him to lose consciousness and never regain it.
As we reported, Mooney was involved in the scuffle at some point during the Sept. 16 contest ... and he collapsed and later died. Officials did say, however, that they believe a medical issue -- not a traumatic injury -- led to the death.
A medical examiner's investigation into the final cause and manner of death remains ongoing.
Mooney -- described as a Patriots super fan -- was 53 years old.