The largest ambulance company in the United States has been ordered to pay $1.5 million in damages after a jury found it responsible for the death of a 67-year-old dialysis patient from Massachusetts, a lawyer for the patient’s family said.

In a verdict reached Monday after a two-week trial in Middlesex Superior Court, American Medical Response was found liable for the death of Barbara J. Grimes.

The jury found that two EMTs negligently dropped Grimes on her head while rolling her onto a stretcher that tipped over in the parking lot of Fresenius Medical Care in Plymouth on Jan. 31, 2009, the family’s lawyer, Marc L. Breakstone, said in a statement.