He was identified through dental records, the coroner's office said.
While a Hobart battalion chief worked to extinguish the flames, he found human remains outside in the field, authorities said.
The firefighter was taken from the scene to a local hospital and reported still feeling soreness early Friday.
In addition to Merrillville firefighters, crews from Lake Hills, Lake Ridge, Hobart, New Chicago, Crown Point, Lakes of the Four Seasons and St. John responded to provide aid.
The majority of fires in the United States are caused by people, many of which start with someone burning debris, the Indiana Department of Natural Resources reports.
Fire Chief Dave Crane said the fire originated as an open burn in residents' backyard, but the fire spread to the surrounding forested area.
The chief cautioned that with it being a dry season and with layers of leaves blanketing the ground, the risk for brush fires is high.
High winds continued Tuesday across Northwest Indiana, knocking out power for some residents and fueling a brush fire in Gary, officials said.
Brush fires spurred on by high winds Monday evening kept firefighters busy around Newton County, southern Lake County, as well as Pembroke Tow…
Crews plan to ignite controlled brush fires Wednesday in the Hobart and Beverly Shores areas, officials said.
GARY | Billowing smoke from a brush fire briefly slowed traffic Tuesday afternoon on Interstate 80/94 in Gary, Indiana State Police said.
WINFIELD | A pickup truck struck an electrical pole at U.S. 231 and Arizona Street in Winfield on Saturday afternoon, sparking a brush fire an…
About 15 region homes were temporarily evacuated Saturday in the wake of a brush fire that sparked towering flames in Porter County.
HEBRON | Two firefighters rushing to the scene of a 25-acre wheat field fire in Hebron were injured Friday when their truck hit a sinkhole and…