Meir Kahane wear a kippah?

[Mein Koran]

I know its a strange question but in all the pictures and interviews of Meir Kahane that I've seen he doesnt appear to be wearing a kippah. Why is this? Are kippahs required by Jewish law? Or are they just customary?

[Tag-MehirTzedek]

He did. It was at his back. For example see this

https://www.google.com/search?hl=en&sugexp=les%3B&gs_rn=4&gs_ri=psy-ab&tok=DpE3aKhxm9gj6zlMQhaDGA&pq=or+harayon&cp=5&gs_id=h&xhr=t&q=meir+kahane&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.&biw=1024&bih=667&ion=1&um=1&ie=UTF-8&tbm=isch&source=og&sa=N&tab=wi&ei=tCAuUaewA9KC0QG6wYHoCQ#imgrc=uDhv8zaKk9VzlM%3A%3BfYZ65qgrJe-LpM%3Bhttp%253A%252F%252Fwww.masada2000.org%252Fravkahane.JPG%3Bhttp%253A%252F%252Fwww.masada2000.org%252Fkahane.html%3B200%3B251