As the title suggests this is the Witch-king of Angmar V2! The helmet design was modified from someone on the LOTR Gallery on the LEGO Lord of the Rings Website. I don't have all the parts to do his flail but once I get my next Bricklink package I will add a pic of him and the weapon. For now he is armed only with a Morgul Blade.
The Witch-king of Angmar was one of the Nine Ringwraiths; a Nazgul. He was the leader of the Wraiths and stabbed Frodo on Weathertop. Glorfindel had prophesied that no living man would kill the Witch-king and this prophecy came true on the Pelennor Fields being killed by Eowyn, daughter of Eomund. Merry assisted in the destruction of the great Nazgul by stabbing him in the leg though Merry's arm was wounded and Eowyn's arm was broken as her shield was destroyed in the Witch-king's last stand.
Wow, very detailed. I bet it's fragile! One thing I noticed is that it's difficult to see clearly that he's holding a sword in his left hand, the angle of the photo sort of hides it. But other than that, I'm amazed at the detail you got into his helmet! Instantly recognizable!