A man who was bitten by a dog during an "altercation" has died, police have said.
The 55-year-old victim was taken to hospital in a critical condition following the incident in Wakefield, West Yorkshire, on Saturday afternoon and died later that evening.
Another 55-year-old man has been arrested on suspicion of murder, and being the owner of a dog dangerously out of control in a public place causing injury.
The dog, a German Shepherd, that is thought to have been involved has been seized by police.
West Yorkshire Police initially received reports just after 1.30pm that an altercation had taken place on a footpath off Blacker Lane, during which the man was bitten by the canine.
The area is often used by walkers, according to officers.
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Detective Chief Inspector Michael Cox said: "Sadly, a man has died and it is really important that we understand the circumstances of what has taken place.
"We know that two people, one named Sophie, stopped to assist the injured man and direct officers."
Mr Cox added: "We would urge these two women to come forward to help us with our ongoing enquiries into this tragic incident.
"The initial altercation has happened in an area used by walkers and we are urging anyone who has potentially seen or heard any part of the exchange between these two men to please make contact."
Anyone with information should contact West Yorkshire Police.
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