Masten Wanjala escaped two days ago but was chased by a mob.
The 20-year-old admitted to killing 10 young boys over a five-year period, including drugging them and, in some cases, drinking their blood.
This sparked a police manhunt in Kenya after he fled.
According to the Kenyan newspaper Standard, Wanjala returned to his parents’ home in Bungoma town and was strangled by neighbors when they found out he was there.
“We don’t know how he managed to travel from Nairobi to his rural home,” police spokesman Musyoki Mutungi said.
“It was the curious villagers who identified him first and went to kill him before the police could even be informed. “
Police are still carrying out a “basic check” to confirm that the body is that of Wanjala, who has allegedly been identified by his family.
Wanjala had escaped during a morning call Wednesday.
Three officers who were on duty at the time were charged with aiding a suspect’s escape and negligence.
He posed as a football coach to trick his victims into following him to isolated areas where he would then attack them and in some cases take them hostage for money.
He was 15 when he killed his first victim, 12-year-old Purity Maweu. The killings took place in Nairobi, as well as in eastern and western Kenya.
The body of Grace Adhiambo’s teenage son was found severely decomposed.
She told the BBC that she would ‘have loved’ to see Wanjala brought to justice for Brian’s murder, and to explain ‘why he brutally killed our children and left us in pain’.
In a series of tweets, Kenya’s Criminal Investigations Directorate – which previously described Wanjala as a ‘bloodthirsty vampire’ – said: ‘The Criminal Investigations Directorate was determined to bring the suspect to justice. in court for every crime. However, the law of the jungle as enforced by angry villagers prevailed.
“Our hearts go out to the families of those who lost their innocent children to the suspect. We reiterate our commitment to ensuring that we continue to serve with dedication, care and integrity. “