A woman has died after being hit by a royal motorcade that was escorting King Charles' sister-in-law

• An 81-year-old woman has died after being struck by a motorcycle escorting a British royal.
• Helen Holland died due to brain injuries that occurred after the crash on May 10.

An 81-year-old woman has died after being hit by a police motorcade that was escorting King Charles' sister-in-law, Sophie, Duchess of Edinburgh, BBC News reports.

Helen Holland, from Birchanger in Essex, was in London visiting her sister on May 10 when she was hit by the motorcycle in Earl's Court, London, according to the publication. She was taken to hospital and remained in critical condition for two weeks, BBC News reported on Wednesday.

In a statement issued to the BBC, Holland's family said she fought "for her life for nearly two weeks... but irreversible damage to her brain finally ended the battle."

Holland's son, Martin, said in a statement obtained by the Daily Mail that she had suffered "multiple broken bones and massive internal injuries" in the lead-up to her death. He added that she had been struck by the vehicle after using the "safe route" as she used a pedestrian crossing to cross the road next to traffic lights.

"The Duchess of Edinburgh is deeply saddened to hear that Helen Holland has passed away. Her Royal Highness's deepest condolences and sympathies go to all of Ms Holland's family," a Buckingham Palace spokesperson said on behalf of the duchess in a statement shared with Insider.

The events that led to Holland's death are being investigated by the Independent Office for Police Conduct (IOPC).

In a statement shared to IOPC's website on Friday, a spokesperson for the organization said it was looking for eyewitnesses and confirmed that an independent investigation was underway.

A spokesperson for IOPC told Insider on Wednesday that the investigation is at an "early stage" and that the organization is still looking for eyewitnesses following its appeal last week. The spokesperson added that the organization's thoughts are with Holland's "family and friends following their loss."

Chief Supt Richard Smith, head of the Metropolitan Police's Royalty and Specialist Protection Unit, told BBC News that the police will "continue to co-operate with and support" the investigation and that "thoughts are very much with the woman's family and loved ones."

Martin Hennessy, who said he witnessed the aftermath of the crash, told the Daily Mail that black screens which had been placed around an electricity unit close to the crossing where Holland was struck meant pedestrians were unable to see oncoming traffic.

Representatives for Buckingham Palace and Metropolitan Police did not immediately respond to Insider's request for comment.