A 20-year volunteer with the Prince George’s Fire department who suffered a heart attack while on duty Jan. 6 died in the hospital Wednesday, officials said.

James “Doc” Delbert Brooks, 62, was a member of the county’s volunteer Marine Fire Rescue. As he was preparing boats and the station last week for the cold weather expected from the polar vortex, he called 911 because he had trouble breathing, according to a statement from the Prince George’s County Fire Department.

Rescue crews were called, and Brooks was taken to a Washington hospital.

Brooks had remained in the hospital in critical condition over the past week, with family, friends and other fire and rescue personnel by his side, officials said.

Fire officials are planning a memorial service for Brooks with full department honors.

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