Santiago, Aug. 23. - Investigation of the killing of a negro sentinel of the Eighth Illinois regiment by Cubans at San Luis has been made by General Shafter, who expressed disgust at the undisciplined condition of the Chicago colored boys. The Cubans attempted to pass the sentry. when he challenged them. They misunderstood the challenge, and when the negro fired on them the Cubans returned the fire, killing the sentry instantly. General Shafter in his latest report announces the death of Private C. W. Richardson of eompany L, First Illinois volunteer infantry, at Santiago. According to the report there are now 1,101 sick in hospitals, of which number 817 have fever. Members of the First Illinois at Santiago will sail on the Berlin Aug. 25.