Cops said Kumar, who likes scoffing raw meat, also removed his heart and slung it by his school - because he hated going there and thought it would have to be closed when the organ was found.
He strangled him before cutting his body into six pieces, washing them and stuffing them into a sack, said officers.
He then allegedly dumped the bag and its gruesome contents 50 yards from the Deepu’s home.
Petty criminal Kumar was inspired by TV programmes, said police who arrested him in Ludhiana, India, on Friday.
A spokesman said: “He behaved normally, as if nothing happened. He said he is fond of crime shows based on real-life incidents on television.”
Investigator Jatinder Singh revealed his parents said he liked eating raw meat.
“He used to tell his parents that sometimes he feels like eating himself. He also had a craving for human flesh.”
Kumar and Deepu were from distant relatives from poor families who migrated from Uttar Pradesh.
Neighbours said that despite their poverty, Kumar’s parents sent him to a private school.
“But he would roam the streets instead of going to school,” said one resident.
Aadesh Punj, vice-principal of Holy Heart Senior Secondary School said Kumar was a persistent troublemaker and was expelled two months ago after he and others tried to burgle a temple.
“If the police are unable to punish him, they should hand him over to us.”
“My wife Sangeeta is in shock. I have not told her about how our son was killed. I fear she will die if she comes to know of the brutality perpetrated on Deepu.”
Deputy commissioner of police Bhupinder Singh Sidhu said: “We will present the case in the best possible way to get maximum punishment.”