Prince William may have helped save a woman’s life Thursday in his final shift as an air ambulance pilot.

According to Norfolk police, officers responded to a 999 call “relating to concerns for the safety” of a woman in her 50s. She had been reported missing and then was struck by a marked police van in Hethal.

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The East Anglian Air Ambulance (EAAA) crew, including Prince William, was called to the scene Thursday night. The woman was treated for serious head injuries and then taken to Addenbrooke’s Hospital in Cambridge via air ambulance.

“The EAAA crew, which last night included William, attended an incident south of Norwich, which involved a road traffic collision-related injury, and a patient was treated at scene for severe head injuries then treated at Addenbrooke’s Hospital,” said an air ambulance spokesperson. According to the EAAA, the woman remains in “life-threatening condition.”

The crew arrived back at their base in Cambridge at about 1 a.m., the end of the Duke of Cambridge’s last shift.

The crew had also responded earlier that night to a call about an elderly woman who had fallen and suffered leg injuries. They flew her to Addenbrooke’s Hospital in Cambridge as well.

Tracy Stressing, a witness who had seen the prince on the job that night, told The Telegraph, “I had just heard the news on the radio that it was Prince William’s last day, and then a friend called to say he had just landed in the park nearby. I couldn’t believe it and rushed there to take some photos.”

Prince William, 35, clocked over two years of flying medical crews before retiring this year.

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“As part of the team, I have been invited into people’s homes to share moments of extreme emotion, from relief that we have given someone a fighting chance, to profound grief,” he wrote in the East Anglian Daily Times earlier this year. “I have watched as incredibly skilled doctors and paramedics have saved people’s lives. These experiences have instilled in me a profound respect for the men and women who serve in our emergency services.”