Who was Ismail Haniyeh, the Hamas political leader who was killed in Iran?

The Hamas movement over the years lost dozens of its leaders in Israeli assassinations in Gaza, the West Bank and abroad, but those deaths have not appeared to weaken the movement. Israeli killed the founding and spiritual leader of Hamas, Sheikh Ahmed Yassin, and many top leaders in the second intifada from 2001 to 2005, but in fact did not appear to diminish the movement.