BLUE MOUNDS, Wis. — Investigators are asking anyone who spoke to Nicholas Day in the months before he was killed in January to contact law enforcement, even if you don’t believe your interaction was significant or important to the homicide investigation.

The Dane County Sheriff’s Office said Friday that it is still seeking information from citizens who had contact with Day in months leading up to his death on Jan. 15.

Nicholas Day was killed on CTH JG in the town of Blue Mounds on Jan. 15. If you had any interactions with him on the weeks or months before his death, please reach out to our detectives at (608) 284-6900. #justicefornick pic.twitter.com/kqo80WL8xw — Dane County Sheriff (@DaneSheriff) February 7, 2020

Day’s body was found off County Road JG near the border with the town of Vermont, officials said. Sheriff Dave Mahoney has called the killing an “extremely brutal homicide and very calculated.”

The case was originally thought to be a hit-and-run, but autopsy results showed Day died from “homicidal violence.” Officials have not released details on the cause of Day’s death.

Officials on Friday asked “anyone who had either a personal or professional relationship or interaction with Nicholas, whom we haven’t spoken with, to reach out” by calling 608-284-6900 or Dane County Communications at 608-255-2345.

“Even if you don’t believe your interaction was significant or important to our investigation, we’d like to hear from you,” the sheriff’s office said in the release.

Officials said anonymous tips can be left on the tipline or online via danesheriff.com/crimetips/other.

The sheriff’s office would also like to reiterate that our detectives want to speak with anyone traveling through the Mt. Horeb and Blue Mounds area on Jan. 15. That includes the area of County Road JG, Bergum Road, Stewart County Park and Bohn Road.

“Whether your travels were for business or recreation, you may be able to provide important information,” the sheriff’s office wrote.

Deputies are following up on tips, reviewing video and conducting interviews, officials said.

Detectives also want to speak with anyone who might have been working in the area, including delivery drivers, utility workers and construction workers, and have asked for help tracking down vehicles and people who were seen in the area.

The sheriff’s office said that a pickup truck investigators had asked for help locating on Wednesday was identified and determined to be not involved in the case.

Madison Area Crime Stoppers is offering a $1,000 reward for any information leading to an arrest.