A Russian woman was shocked when the son she thought she buried four months earlier showed up on her doorstep.
Baffled cops are at a loss as to what to do because he has now been officially declared dead after his mother identified the body.
They also do not know the identity of the dead man who was cremated.
The son said that he had just gone off to take some time out and "think about the meaning of life".
Antonina Mikhailovna, 62, who is from Kronstadt which is a town located on Kotlin Island just west of St Petersburg, had reported her 43-year-old son Konstantin missing on March 18.
She said he had been missing for six days, and did not know where he was.
She claimed that it was one of the worst days of her life a month later when she then got a call from police saying that they believed they might have found his body, and she was called to the morgue where she positively identified him.
The family, including Konstantin's estranged wife and daughter, then arranged the funeral, which was followed by cremation and his interment in the local cemetery.
But four months later, his mother got a knock on the door, and was stunned when she opened it to find her son standing outside.
She told local media she almost collapsed with shock when she saw the "dead man" standing outside.
Police admit now they are baffled about the best way forward.
“In the morgue of the Frunze district of St Petersburg, the mother, Antonina Mikhailovna identified her son Konstantin as being a dead person who was kept there,” a police spokesman said.
He said that the man had now officially been declared dead, and they have the added problem of not knowing who the dead man was and who had been cremated.
She told police that she was very upset at the time, and apologised for misidentifying the body that she was shown.
"He looked very familiar, and so I confirmed to police that he was my son," she said.
Konstantin, who graduated from military school and worked locally on the island which is a huge naval base, said life got too much for him, and he had needed to take some time out to discover himself.
"I was thinking about the meaning of life, and what I want to do with myself," he said when quizzed by the cops.
He now however needs to work out how to get his life back, and find out who it was that with their death took his old life away.
Police confirmed they are investigating.
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