Tom Sawyer saw him murder Dr. Robinson in the cemetery & testified against him in court
Injun Joe 
promises not... [DOC] [TLE] The Adventures of Tom Sawyer: Chapters 9-11 - CliffsNotes [PAR] Summary That night Tom and Huck take the dead cat to the graveyard, where 
there they hear voices belonging to Muff Potter (the town drunk), Dr. Robinson, 
and In.