This is Dr. Peter Hackett who, it’s proven, called Shannan’s mother after she went missing. DR. PETER HACKETT. Peter Hackett is an Oak Beach resident and former surgeon who called Mari Gilbert two days after her daughter’s disappearance. He'd given her some medication to calm her down, and he was worried about her, is she home?" That theory, Ray said, came from a former police surgeon, Dr. Charles Peter Hackett, who lived near the marshy area where Gilbert’s body was found. Dr. Peter Hackett was a former physician, who had worked for Suffolk County as a police surgeon. The family learned that Shannan's driver dropped her off at her client's house at 2 a.m. Nearly 3 hours later, Shannan made a panicked 23-minute call to 911. He is a leading authority on altitude illness, high altitude climbing, wilderness medicine, and the effects of altitude on people living and working in the mountains. Charles Peter Hackett, D.O., a/k/a C. PETER HACKETT, D.O., Defendant(s). The morning after Shannan went missing, Dr. Hackett called Shannan’s mother Mari Gilbert, telling her not to worry about Shannan because Dr. Hackett ran a home for wayward girls and Shannan was in his care. ... Dr. Peter Hackett. Dr. Peter Hackett is a world renowned high altitude expert and altitude research pioneer. Although Shannan’s mother says Hackett confessed to interacting with Shannan the night she went missing, Dr. Hackett … Dr. Peter Hackett (Charles Peter Hackett according to court records) is a retired emergency services doctor. He was married, with children of his own and was, by my guess at this point in-time, well into his fifties or early sixties. Dr. Hackett is also a board certified Emergency Physician. The former Oak Beach resident got involved in the case shortly after Shannan went missing, CBS News reported. Dr. Hackett denies making this call and says he has no idea why there is a record of it. The Long Island serial killer (also referred to as LISK, the Gilgo Beach Killer or the Craigslist Ripper) is an unidentified suspected serial killer who is believed to have murdered 10 to 16 people over a period of nearly 20 years, mostly prostitutes, and left their bodies in areas on the South Shore of Long Island, New York.. "And he said he ran a wayward house for girls, Shannan was the, she was upset, she needed to get off the streets. ... Dr. Charles Peter Hackett, in Oak Beach, New York, on Jones Beach Island. But perhaps the most baffling part of the story is the place of Dr. Peter Hackett, a local physician. When asked if he was “outright accusing Jimmy Burke of possibly being the Gilgo Beach serial killer,” Ray answered quickly and calmly, “Yes,” and further explained that he believes it is possible Burke and Dr. Peter Hackett could have worked together to murder and dispose of the victims along Gilgo Beach. 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