Ullman said DeRosier \"loved his job\" and \"was incredibly good at it,\" adding that he was rapidly working his way up through the department, Ullman said.

His death marks the first time the sheriff's office lost a deputy in the line of duty, Thurman said. He leaves behind a wife and 5-month-old daughter named Lily, Ullman said.

\"He will be with us forever, and you will be truly missed,\" Ullman said.

An active manhunt is underway for the suspect who shot DeRosier, said Clark County Cmdr. John Horch. Authorities are currently processing the scene of a residence nearby, where a search warrant was just served, Horch said.

Investigators are asking any possible witnesses to come forward with tips on the suspect.

ABC News' Karine Hafuta contributed to this report.

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