A man arrested on suspicion of murder after a series of assaults has been sectioned under the Mental Health Act.
The man, 43, from Tividale, West Midlands, was arrested from a vehicle in a supermarket car park in nearby Oldbury at 6.20am on Monday.
Officers said the suspect was detained on suspicion of three separate assaults involving weapons, including a knife and metal bar, which began at 4pm on Sunday.
Following the man's arrest, the body of another man was found with fatal stab wounds at a property in Corngreaves Walk, Cradley Heath, on Monday. It is believed the victim had been killed some time the previous evening.
Detective Chief Inspector Edward Foster, of West Midlands Police, said: "I'm appealing for anyone who was in the Corngreaves Walk area at around 6pm on Sunday and saw or heard a disturbance to contact us.
"They could hold important information.
"We have established a timeline of offences and suspect three people were subjected to nasty assaults involving weapons, including a knife and metal bar, in the space of just over two hours.
"These are understood to be domestic incidents where the suspected attacker is known to the victims.
"It's then believed the same attacker stabbed a man in his home in Corngreaves Walk just after 6pm but that his body lay undetected in the house until just before midday the following day. Police family liaison officers are supporting the deceased's family at this tragic time."
Anyone with information is asked to call West Midlands Police on the 101 number.