TALLAHASSEE, Fla. — The type of blood clot revealed in the autopsy of a woman who died after being forcibly removed from a hospital is often “difficult to detect and can be impossible to treat,” hospital officials said Wednesday, while a lawyer representing the woman’s family insisted both hospital staff and police were negligent.

Barbara Dawson, 57, collapsed Monday while being escorted in handcuffs from the hospital, where she went for treatment for breathing difficulties, Blountstown Police Chief Mark Mallory said. She was arrested for disorderly conduct and trespassing when she refused requests to leave, Mallory said.

The medical examiner’s office in Panama City found that Dawson died from a blood clot due to being excessively overweight, Mallory said in a statement Wednesday. Neither the autopsy report, nor the police report, nor the dashcam video has been released.

During a news conference later Wednesday, Calhoun Liberty Hospital CEO Ruth Attaway said the hospital would cooperate with state investigators who are looking into the matter, and the circumstances of Dawson’s death would be fully reviewed. Attaway refused to address why hospital staff called police to remove Dawson. She added the only time hospital staff ask police to remove patients is when there is a concern about other patients’ safety.

“Based on information from the 14th District ME’s office, Ms. Dawson passed away due to pulmonary saddle embolus, or a blood clot in her lungs,” Attaway said. “While we can’t speak about her condition, we can generally address this medical condition. A pulmonary embolism is often immediate and fatal. It is difficult to detect and can be impossible to treat.”