From Narrative of the Life of Frederick Douglass, Chapter 4:

Mr. Gore once undertook to whip one of Colonel Lloyd’s slaves, by the name of Demby. He had given Demby but few stripes, when, to get rid of the scourging, he ran and plunged himself into a creek, and stood there at the depth of his shoulders, refusing to come out. Mr. Gore told him that he would give him three calls, and that, if he did not come out at the third call, he would shoot him. The first call was given. Demby made no response, but stood his ground. The second and third calls were given with the same result. Mr. Gore then, without consultation or deliberation with any one, not even giving Demby an additional call, raised his musket to his face, taking deadly aim at his standing victim, and in an instant poor Demby was no more. His mangled body sank out of sight, and blood and brains marked the water where he had stood.

A thrill of horror flashed through every soul upon the plantation, excepting Mr. Gore. He alone seemed cool and collected. He was asked by Colonel Lloyd and my old master, why he resorted to this extraordinary expedient. His reply was, (as well as I can remember,) that Demby had become unmanageable. He was setting a dangerous example to the other slaves,—one which, if suffered to pass without some such demonstration on his part, would finally lead to the total subversion of all rule and order upon the plantation. He argued that if one slave refused to be corrected, and escaped with his life, the other slaves would soon copy the example; the result of which would be, the freedom of the slaves, and the enslavement of the whites. Mr. Gore’s defence was satisfactory. He was continued in his station as overseer upon the home plantation. His fame as an overseer went abroad. His horrid crime was not even submitted to judicial investigation. It was committed in the presence of slaves, and they of course could neither institute a suit, nor testify against him; and thus the guilty perpetrator of one of the bloodiest and most foul murders goes unwhipped of justice, and uncensured by the community in which he lives. Mr. Gore lived in St. Michael’s, Talbot county, Maryland, when I left there; and if he is still alive, he very probably lives there now; and if so, he is now, as he was then, as highly esteemed and as much respected as though his guilty soul had not been stained with his brother’s blood.