At that point, Jesus was dead.

Gospel of Matthew says he gave the money to the priests and they bought land, while he hung himself.  The disciples were scattered and in hiding.

Acts says he bought land and his body burst open on it.

Another early Christian writer reported he was crushed to death under chariot wheels.

I don't think the authors really knew Judas's fate.  I doubt the apostles went up to the priests and asked who really bought that land and what happened to the blood money they'd paid.  There were obviously several rumors going around.  But he made a good object lesson.