Police have appealed for witnesses with dashcam footage to come forward.
Stephen Charlton had only been in a relationship with Natalie Saunders for six-weeks when he murdered her.
Adrian Roberts has been released while investigations continue, the force says.
What are the stories the BBC should be telling about Middlesbrough?
Councils affect services such as housing and schools so why are people apathetic about electing them?
Britt Assombalonga's early goal sees Middlesbrough beat Stoke to return to the Championship play-off places.
The One-Day Cup continues with eight fixtures - listen to BBC radio commentary.
Darlington & Stockton Times
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