Former NFL QB Marcus Vick copped a plea deal in his April arrest for fighting cops, but he's still going to do time behind bars ... TMZ Sports has learned.
Michael Vick's younger brother was being arrested in Virginia on a warrant -- from a previous case -- when he attacked the cops who tried to take him into custody. He was charged with felony assault on a police officer, resisting arrest and obstruction of justice.
According to court records, 32-year-old Vick cut a deal with prosecutors and pled guilty to resisting arrest .