ZIONSVILLE, Ind. -- Lucius Oliver Hamilton III, the 61-year-old man police say shot and killed his niece and her son in Zionsville Wednesday morning, is dead from an apparent self-inflicted gunshot wound.

Police tracked him down to the Hilton in the 100 block of West Market Street Wednesday afternoon around 3 p.m.

State police knocked on a door and Hamilton said "yes?" Two shots were then fired. However, there is no indication that shots were fired at law enforcement.

At that point, law enforcement only moved in when they determined with electronic equipment that Hamilton was not moving.

He was found dead with a gunshot wound to the head. There was also alcohol and prescription drugs in the room.

Hamilton's vehicle has been found and processed as part of the crime scene, according to police. Police do not have any information as to why he went to the hotel.

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“I could not be more proud of all the law enforcement officers involved today. Agencies from across the state, including our federal partners, offered every resource available to locate Hamilton. We were able to utilize these resources to work, process and secure the scene. Through many investigative techniques, we were able track Hamilton down to a specific location in downtown Indianapolis where he cowardly took his life instead of choosing to face justice for his actions. My heart goes out to the Giehll family and to the first responders that witnessed this horrific scene," Boone County Sheriff Michael Nielsen said.

RELATED | PHOTOS: Zionsville double homicide search

Katherine Giehll, 31, and her 4-year-old son Raymond were found dead in a home in the 6800 block of Old Hunt Club Road Wednesday morning. They died from apparent gunshot wounds, law enforcement said. The Boone Co. Sheriff believes Hamilton entered the home around 8 a.m.

The Sheriff said it was Katherine Giehll's birthday.

“It was her 31st birthday today. We did this girl justice, and that little baby justice. So it’s sad that it had to happen at all, it’s sad that it had to happen at all. But what I can tell you, is that in 8 hours, we solved this crime," Nielsen said.

Raymond attended Traders Point Christian School. In a letter to parents the school said:

We have been informed that one of our 4 year-old students, Raymond Giehll, and his mother were found dead this morning in their home. He attended Mrs. Jane Evans' 3's class on Tuesday and Thursday mornings. There is no earthly explanation for this but we can trust God even in the midst of this tragedy. Please join us in praying for Mr. Giehll, the extended family, and our EC staff as they process through an incredibly difficult time.

Police say Hamilton, who lived in Carmel, is the uncle of the woman found dead.

Hamilton was an employee of Wabash College, where he has served as an Alumni Career Officer and a Major Gifts Officer.

FULL COVERAGE | 'There is no earthly explanation for this' | Motive behind Zionsville homicides was inheritance | Zionsville murder suspect is dead | Who was Lucius O. Hamilton III? | Sheriff: One of the worst things I've ever seen | PHOTOS: The Giehll family remembered | PHOTOS: Zionsville double homicide suspect search | Classes canceled at Wabash College for manhunt |

Wabash College was on lockdown for part of the day Wednesday as police searched the area.

Law enforcement says Raymond was shot while watching TV Wednesday morning. Both victims were found by a neighbor.

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