A 28-year-old white supremacist named Evan Spencer Ebel, who was killed by Texas police in a gun battle following a high-speed car chase, is suspected in the killing of a Colorado prison chief as well as a pizza delivery man.

The prison chief, 58-year-old Tom Clements was shot and killed Tuesday when he answered the door of his home, which is in El Paso County, 45 minutes away from Denver. Hornady 9mm bullets, which Ebel fired during his shootout with the Texas police, were found at the scene of Clements' murder, according to reports.

A pizza delivery man's shirt was found in Ebel's trunk, leading police to suspect that a delivery man named Nathan Leon, who was killed two days prior to Clements, was another Ebel victim.

Ebel was a Denver parolee who had ties to the 211 Crew, a white supremacist group founded in 1995 out of Colorado's Denver County Jail. According to prisonoffenders.com, the 211 Crew commit robberies, deal drugs, and have spread into the Colorado streets. They are identifiable by "211" tattoos and also sport Byzantine and Nazi symbols.

His chase with Texas police began after he shot an officer during a traffic stop and fled; the chase ended when his car collided with a tractor trailer. In the ensuing gunfight, Ebel was shot in the head and killed.

Ebel had been arrested at least seven times between 2003 and 2010, for crimes ranging from burglary to assault, to menacing.

Scott Robinson, a Denver lawyer who represented Ebel in the past told Reuters, "He clearly was a troubled young man, but there was nothing that would have suggested he was capable of these types of incidents."

Authorities are also looking into any connection between Ebel and the murder of Mark Hasse, a Kaufman County (Texas) prosecutor. The Kaufman County District Attorney's Office is involved in a racketeering case against the Aryan Brotherhood. In a statement, Kaufman Police Chief Chris Aulbaugh said "The Dallas and Denver offices of the Federal Bureau of Investigation are comparing the homicides of Mark Hasse and Tom Clements to determine if there is any evidence linking the two crimes."