Praveen Kumar was arrested from Bahawdi village in the district yesterday, SIT inspector B L Yadav said.
Kumar was involved in four cases of murder and two of arson during the riots that took place last year, Yadav said, adding, he has been absconding since then.
Three persons of a family were murdered and their houses burnt, while one person was murdered in another incident and his house burnt by the rioters at Bahawdi village under Phugana Police Station in the district on September 8, 2013, police said.
He was sent to 14 days judicial custody by Chief Judicial Magistrate Narender Kumar, the inspector said.