The book of Matthew says that Judas went and hanged himself.
Luke wrote in Acts 1:18
18 Now this man purchased a field with the reward of iniquity; and falling headlong, he burst asunder in the midst, and all his bowels gushed out.
Some people view this as a contradiction. But 'hanging' back then was often by impailment rather than a rope around the neck as we think of from movies about the old west or medeival Europe.
My theorize is an messy impailment of his abdomen on a broken or sharpened tree branch, with his body falling off headfirst, and his guts coming out.