Bhim Sen Kohli died in hospital after he was seriously assaulted in Franklin Park in Braunstone Town, near Leicester, on Sunday night.
The death of the 80-year-old man, who was discovered lying under a tree by his daughter, has shaken the local community.
It also triggered a murder investigation by Leicestershire Police with five children – a boy and a girl aged 14 and one boy and two girls aged 12 – arrested on suspicion of murder.
Last night, the force confirmed that four had been released with no further action. Only the 14-year-old boy remains in custody.
A post-mortem examination has found Mr Kohli died as a result of a neck injury, pending further tests.
The attack happened close to the park entrance in Bramble Way and a group of young people fled the scene before emergency services arrived, the police said.
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