Between April 8 and May 7, 1992, six people were shot and killed along a stretch of I-70. The deaths occurred between Terre Haute, Indiana and Wichita, Kansas, and Vox says there were striking similarities between the victims. Five were women (and police believe that the sixth was mistaken for a woman when the killer saw his long ponytail), all were brunettes, and all were employees at stores just off the highway.

They were also all killed with a .22 caliber bullet. There was no sexual assault, no major thefts, and witnesses were able to give police a basic description of a man seen entering the stores before the murders. He was described as white, with reddish or light brown hair, between 140 and 160 pounds, and around 5-foot-7.

The spring of 2022 marks the 30-year anniversary of the still-unsolved murders, and police wanted to make it clear that the case is still very much open. In late 2021, law enforcement released a new sketch of the killer. Based on those witness accounts and aged to depict what the killer would look like three decades on, there’s still hope that someone will come forward with more information. They’ve also released what they believe might be the key to catching him: A description of the gun. Wichita police Detective Tim Relph says (via CBS KWCH12) it’s “a historic remake of an old German Navy pistol. The barrel is long enough where the gun has a wooden forearm.”