Either Arafat was killed by his own people, or he died from heavenly causes, or both. Arafat was irrelvant to Israel, and there was no motive to kill him, especialy since to do so would bring bad publicity for Israel. No this had to have been down by one of Arafats own aides, or heavenly cause, or both.
Riot police line up as fresh migrant protests erupt at Budapest railway station (Reuters)
from the article: Arafat aide calls on Chirac to reveal truth about Arafat's death