Peter Salem

Evidently, according to the Wikipedia entry below. That is not Peter Salem in the painting

Peter Salem (1750 – 1816) was an African American who served as a soldier in the American Revolutionary War. He was born in Framingham, Massachusetts, a slave of Jeremiah Belknap. Salem was later sold to Lawson Buckminster, who gave him his freedom. {At least one record calls him "Salem Middlesex"}
Peter Salem took part in the battle of Concord on April 19, 1775. One week later, he enlisted in Captain Drury's company of Colonel John Nixon's regiment (6th Massachusetts Regiment). He served with his regiment in the Battle of Bunker Hill, where he supposedly fired the shot that killed British Marine Major John Pitcairn. Salem reenlisted in 1776, and fought again at the battles of Saratoga and Stony Point.
After the war, he lived near Leicester, Massachusetts and married Katy Benson in September 1783. He died in the poor house at Framingham in 1816 at the age of 68. A gravestone monument was erected in 1882 in Framingham in his memory.
Salem became well-known in American history in part because for a long time it was thought that he was the black soldier shown in John Trumbull's famous painting of the Battle of Bunker Hill. Historians in the 1980s determined that the soldier in the painting was actually Asaba Grosvenor, the enslaved servant of Lieutenant Thomas Grosvenor.