What Killed Arafat?

In 2004 Yasser Arafat suddenly fell mysteriously ill. Doctors from around the world rushed to save him but he died within weeks and ever since it's been an unsolved case. It was convenient timing for Israel and the US who wanted him out of the way. But no investigation followed. This investigative doc made the news worldwide when it recruited forensic scientists and discovered traces of a deadly radioactive poison on his clothes. Was Arafat murdered?