INDIANAPOLIS -- An off-duty Indiana State Police trooper fatally shot a man who was trying to break into the trooper's east-side Indianapolis home Monday morning, police said.

Police said Trooper Joel D. Wilson, 39, was alone inside the home in the 2100 block of Autumn Creek Drive when Theodore E. Hixenbaugh knocked on the front door at about 11:40 a.m. Wilson saw Hixenbaugh from a place Hixenbaugh couldn't see, and Wilson didn't know who Hixenbaugh was, police said.

Authorities said Wilson, whose home had been burglarized last month, picked up his duty pistol and approached the door. Hixenbaugh began to kick the door in an apparent attempt to break in, and Wilson fired two shots through the door, hitting Hixenbaugh at least once, police said.

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Video: Police: Trooper Fatally Shot Person Breaking Into His Home

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Hixenbaugh, 22, was taken to Wishard Memorial Hospital, where he was pronounced dead at 12:11 p.m.

Wilson has been with the state police for more than six years.

State police are investigating the incident.

Authorities said Hixenbaugh had been living in the Noblesville area with his girlfriend. Police said Hixenbaugh's family didn't know the girlfriend's name or how to contact her.

State police said they were interested in speaking with the girlfriend. They said she could call state police at (800) 582-8440 and ask to speak with Detective Dan Hearon.