Authorities are looking for Pablo Antonio Serrano-Vitorino, 36, whom police have described as "armed and dangerous"
and possibly carrying an AK-47.
Serrano-Vitorino, an undocumented immigrant from Mexico, was deported from the United States in 2004. It's unclear when he returned to the country, according to U.S. Immigration and Customs Enforcement.
By September 15, ICE was aware that Serrano-Vitorino had illegally returned after he was fingerprinted at the Overland Park Municipal Court in Kansas. But ICE erroneously issued a detainer for him to the nearby Johnson County Sheriff's Office instead of Overland Park. As a result of the error, Serrano-Vitorino was not taken into custody.
He is wanted in a quadruple fatal shooting that occurred in the early morning hours Tuesday, according to investigators from the Kansas City, Kansas, police department. Three men died at the scene and one died at a hospital.
The identities of the victims are being withheld pending notification of next of kin.
CNN affiliate KCTV
reported that, according to police, Serrano lived next door to the home where the killings took place. Officer Thomas Tomasic told the Kansas City station that it is unknown what prompted the shootings.
Serrano-Vitorino's truck was found on I-70 near Montgomery County Missouri, approximately 170 miles east of Kansas City.
The suspect might be involved in the death of a fifth man, a spokesman for the Missouri State Highway Patrol said.
Lt. Paul Reinsch told CNN that a 49-year-old Montgomery County man was found dead in a home near where officers found Serrano-Vitorino's truck.
Reinsch wouldn't say how the man died. He said there was no indication of any vehicles or anything else being stolen from the home or nearby properties.
Serrano-Vitorino was last seen wearing a red and black flannel jacket, blue hooded sweatshirt and possibly blue jeans, authorities said. About 100 officers are searching for Serrano,
Anyone who thinks they have seen the suspect should call 911, *55, or 816-474-TIPS (8477).