Heroic passers-by grabbed a man in the street moments after he had allegedly stabbed a woman in her 70s to death while she was in her car.
Police raced to the horrific scene in Luton, Beds, this afternoon and arrested a man after members of the public reportedly held on to him.
The victim was treated by paramedics but was pronounced dead shortly afterwards.
Police originally arrested a man in his 50s - who is known to the victim - on suspicion of attempted murder.
He was later re-arrested on suspicion of murder after the woman died.
Bedfordshire Police's DCI Jonathan Hutchinson, investigating, said: "We have launched a murder investigation and a team of detectives is now piecing together exactly what happened.
"I would like to reassure residents that this is an isolated incident.
"This is obviously an extremely difficult time for the victim’s family but our officers are working with them to establish what happened prior to the incident."
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