Police in Odisha's Bolangir district arrested Shatrughan Sahu for an alleged ritualistic murder.
The victim, identified as Santosh Kharsel, was found decapitated in a pond on August 21.
Authorities recovered the victim's head buried in the puja room of Sahu's residence.
Investigators believe Sahu lured the victim to his home for a meal before attacking him.
More context
The suspect reportedly confessed to the crime after changing his story from an alcohol-fueled argument.
Police suspect a human sacrifice motive aimed at reuniting Sahu with his estranged wife.
Ritual items, including a copper snake idol, were reportedly seized from the suspect's home.
Several associates or suspects, including Ganeswar Sahu, were also reportedly detained or arrested.
Sahu's wife had allegedly lived separately for years due to his involvement in occult practices.
The murder weapon was recovered by investigators during the ongoing probe.
Local reports indicate the victim was attacked while he slept after the meal.