In 1854 he built a large mansion in his wife's home town, known as the "Hallett House" or "The Aisle of Pines".
In 1863 Hallett’s firm, in association with John C. Fremont, bought the controlling interest in the Leavenworth, Pawnee and Western railroad.
They soon ran short of money and Hallett went before Congress to get additional funds for the road.
Talcott, in a letter to president Abraham Lincoln, accused Hallett of substandard construction of the railroad.
On July 27, 1864, Talcott retaliated by shooting Samuel Hallett dead in the streets of Wyandotte.