Investigators suspect that Day was having an affair. However, not enough evidence exists to arrest the suspect. Police say he has moved out of the state and since remarried. He was shot to death. An arrest warrant was issued for a suspect, but no arrest was made.
Investigators believe their suspect fled to Mexico.
Bonilla-Velesquez is one of four Mexicans whose murders remain unsolved in Weld County. He was fatally stabbed. Arrest warrants were issued for two suspects, but no arrests were made. A suspect was arrested, but no charges were filed. Her acquaintance was injured but survived.