This is the second time Decarlos Brown Jr. has been ruled mentally unfit to proceed in his federal and state criminal cases.

A federal judge has ruled that the man charged in the fatal stabbing of a Ukrainian refugee on a North Carolina train cannot currently stand trial due to mental illness.

Proceedings in the federal case against Decarlos Brown Jr. — accused of fatally stabbing Ukrainian refugee Iryna Zarutska on a Charlotte light rail train last year — will be…