Melinda Vinalis, a work colleague of British football coach Mike Jones, told ITV1's Daybreak: "I couldn't imagine his last moments, that was hard for me. How much he suffered and that he was alone."
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Between 4,000 and 8,000 fighters of the so-called Islamic State are still thought to be in the area.
Police are trying to find the driver of the car following the incident in Kingfisher Close, Brownhills.
An unnamed man died at the scene, while a woman was pronounced dead after being taken to St George's Hospital, Tooting, south-west London.