Daniel Holtz

Daniel Holtz is a fictional character on the television series Angel. He was played by Keith Szarabajka.

Holtz was an 18th century English vampire hunter who chased Angelus and Darla through much of Europe and North Africa. He had connections to an elite order of Inquisitors within the Roman Catholic Church and an army at his command. Angelus and Darla attacked his family, killing his wife and son, and turning his small daughter into a vampire.

The song Holtz can be heard quietly singing to himself throughout the series was first sung by him to comfort his daughter, Sarah, after finding his wife and son murdered. The song is Ar Hyd y Nos (All Through the Night), a Welsh song that later became widely used as a lullaby in England.

Trivia
Holtz is first mentioned in Season Two's "The Trial", though doesn't appear until the first episode of Season Three.

Holtz is very similar to the German word for wood, linking his vampire hunter status with the famous wooden stake, and putting him opposite to the vampire Angel.