All fatalites in Israel regardless of their nature need to be investigated. The only standard for exception is when a person dies while under the care of a licensed physician. And, that is subject to review by the state medical examiner.
U.S. says it killed 10 AQAP Islamist militants in four air strikes in Yemen since April 23 (Reuters)
from the article: IDF to tighten policy of probes into civilian West Bank deaths