Anthony Russell was being sought after a mother and son were killed in Coventry and a woman was found dead on grassland in Leamington Spa.
Julie, 58, and David Williams, 32, were found at separate flats in the city on consecutive days earlier in the week.
The third victim, 31-year-old Nichola McGregor from Leamington, was found on Thursday.
Age
Russell is 38 years old.
Anthony Russell Arrested
Anthony Russell was arrested by police in the early hours of this morning in connection with the three deaths.
Today, Nichola’s twin, Adam McGregor, wrote: ‘Words can’t even express how I’m feeling at the minute. For the first time in my life, I’m afraid of being alone more than ever. Fly high darling twin. RIP twinnie look and watch over us all. Until we meet again.’
Miss McGregor, also known as Nicole, was previously on the run from police herself after she failed to appear in court for possessing a knife.
She had been wanted by British Transport Police after being charged with possession of an offensive weapon and fare evasion in July 2019.
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Mr. Russell was found in a car parked in Staffordshire at about 04:00 GMT, West Midlands Police said.
The red Ford C-Max car, which police said was stolen in a “car-jacking” in Leamington on Wednesday, was found in a lane in the village of Rolleston-on-Dove, near Burton upon Trent.
Mr. Russell is also being held on suspicion of stealing the car.
Julie Williams and David Williams Murder
Julie Williams, 58, was found murdered just before 11 pm on Sunday after concerns were raised about her welfare.
Her 32-year-old son David was reported missing the day before and was found dead at around 11.30 pm on Tuesday.
Two days later, police discovered the body of Miss McGregor.
Assistant Chief Constable Mark Payne said today: ‘The deaths of three people in the Midlands region this week have been shocking and devastating for the families involved.
‘Our thoughts remain with them as they come to terms with the tragic circumstances of their deaths.
‘We are grateful to everyone who has assisted with our appeals for information, but although we have a suspect in custody, our investigation must now establish exactly what has happened.’
The ‘extremely dangerous’ suspect had last been caught on camera three days ago in the posh town of Leamington Spa.
Detectives had urged anyone who knows of the whereabouts to dial 999 immediately.
Investigation
Speaking about the deaths of Mr. and Mrs. Williams, Detective Inspector Jim Mahon, from West Midlands Police homicide team, said: ‘These deaths are very sad and my thoughts are with David and Julie’s family at this difficult time.
‘Our investigation continues at a significant pace but we need to find Russell as soon as possible.