The investigation surrounds the deaths of Kevin Conway, 41, Stephanie Alderson, 35, and Kathleen Broomfield, 43, between July and September of this year.
A woman has been arrested on suspicion of administering a noxious substance as police probe potential links between the deaths of three people over three months in the same area of Teesside.
Meanwhile two men, both aged 47, and a 39-year-old woman have been arrested on suspicion of administering a noxious substance in relation to the death of Kathleen Broomfield. All four remain on bail whilst enquiries are ongoing, police said in a statement. Mr Conway's body was found at an address on Ajax Way on July 15.
The body of Ms Alderson was then found at a property on Ajax Way on Monday. Her mother, Glennis, said: "Stephanie was a much-loved daughter who will be greatly missed."
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