A 51-year-old man has been arrested on suspicion of murder after a man was found at a house in Whiston with fatal injuries to his neck and arms.
The male victim, believed to be in his 50s, was found by paramedics at a house on Martock in Whiston at around 2.40pm on Sunday.
Officers had been called to the address after receiving reports that a man had suffered serious cut wounds.
The victim was taken to hospital but died on route.
Police later arrested a 51-year-old man.
He is currently being questioned by police at a Merseyside police station.
The scene today remains sealed off while forensic officers search the area.
A police spokesman said the victim had not yet been formally identified and appealed for next of kin to come forward.
A Home Office post mortem is expected to take place over the next few days to establish the cause of death.
Anyone with any information should contact detectives in Knowsley CID on 0151 777 6516.