On November 30, 1849 a group of men, including City Marshal Francis Tukey, Henry Jacob Bigelow, Parkman Blake, Robert G. Shaw, and members of the Boston Police Department came to Parker's home to inform him that human remains had been found. Parker advised them to make a complaint and gave them directions on what to do with the body. The body was determined to be that of George Parkman and Harvard Medical School professor John White Webster was arrested for his murder. Parker testified as a government witness during the Parkman–Webster murder case.
