Software company founder John McAfee was taken to hospital on Thursday after being denied political asylum in Guatemala.
His lawyers said they were making a last effort to keep him from being flown back to Belize for questioning about the killing of an American expatriate.
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Sergeant Elor Azaria was caught on video shooting dead the wounded assailant, sparking one of the most divisive cases in Israel's history.
CAFOD said: "Hunger is evident in the thinness of children, and the way clothes hang from the bodies of people already suffering."
Police believe it is a "distinct possibility" that Halliwell was a serial killer, beyond the two murders he was convicted for.