Police have charged a 38-year-old man with the murders of a mother and son in Coventry and another woman near Leamington Spa.
Anthony Russell is accused of killing Julie and David Williams, whose bodies were discovered in the city last week.
Russell has also been charged with the murder of Nicole McGregor, 31, whose body was found in a woodland near Leamington Spa this week after she went missing for several days.
Post-mortem examinations were said to have been “inconclusive”, but West Midlands Police said further tests were being carried out to find out causes of death.
Julie Williams’s body was the first to be found in Riley Square, Coventry on Sunday last week following concerns about her welfare.
A day later, her son David’s body was found in a flat on the same street after he was reported missing on Sunday.
McGregor’s body was found on Thursday, and her family released a statement over the weekend saying she “will be greatly missed”.
"We wish to thank people for their well wishes, Nicole will be greatly missed. We request to be left alone to grieve at this difficult time,” the statement read.
West Midlands Police Detective Inspector Jim Mahon, who is leading the investigation, said: "Our thoughts remain with the families of Julie, David and Nicole as they come to terms with the tragic circumstances of their deaths.
"We want to thank everyone for their assistance with our appeals for information this week, we really appreciate it.
"Our investigation continues and I would urge anyone with information who have not yet spoken to us, to get in touch."
West Midlands Police said Russell is expected to appear at Birmingham Magistrates' Court on Monday and he is also charged with a car-jacking and a section 18 wounding that allegedly took place in Leamington Spa on Wednesday afternoon.