A fifth person was arrested last night in connection to what officials are calling an "inexplicable beating" of a 40-year-old man suffering from a schizoaffective disorder Monday.

According to transit police, the disabled victim was repeatedly punched and kicked after getting into a verbal argument with one of the women suspected of participating in the group beating.

When officers arrived at the Orange Line stop at Downtown Crossing around 12:37 a.m. Monday, they
found the victim bloody, bruised and swollen on his face and body.

He also had several cuts and scrapes as a result of the
alleged attack.


The victim told police he couldn’t remember what happened, but said he was "jumped" after having a dispute with a woman.

Ivan Bacai, 23, of Malden, was arrested last night after transit police issued a warrant for his arrest.

Police have been racking up the suspects since Monday.

Yesterday, Germial Johnson, 28, of Boston turned himself in to MBTA transit police detectives in Dorchester.

Maryanne Hamilton, 29, of Jamaica Plain, the third suspect, was arrested Tuesday and arraigned yesterday, and held on a total of $4,500 cash bail.

Two other suspects — Karen Akiba, 22, of Cambridge, and Bryon Lashus, 32 of Watertown — were arrested shortly after the attack Monday and arraigned in Boston Municipal Court Tuesday.

They were all charged with assault and battery with a dangerous weapon — in this case, a shod foot — and assault and battery on a disabled person after allegedly attacking the victim.

Police said there seemed to be no motive for the attack.

"There is no logical reason why the victim in this case was assaulted. The quick apprehension of the suspects is another example of the excellent work of our detectives," said Transit Police Superintendent-in-Chief Joseph O’Connor in a statement.

The victim was taken to Tufts Medical Center for his injuries, police said.

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