Tom Clements
Colorado Department Of Corrections Executive Director Tom Clements was shot and killed after a gunman rang his doorbell. Colorado.gov

Evan Ebel, who was killed in a shootout with police in Texas on Thursday, is considered a suspect in the death of Tom Clements, the executive director of the Colorado Department of Corrections. And new ballistics evidence released Monday shows that the same gun was used in both incidents.

Ebel, a 28-year-old rumored former member of a white supremacist prison gang, the 211 Crew, was killed at the conclusion of a high-speed car chase in Decatur, Texas, on Thursday, and he has been named by Colorado authorities as a suspect in the shooting death of Clements near his home near Denver on Tuesday, according to NBC News.

Police added that there is a "strong connection" between the death of Clements and the slaying of Nathan Collin Leon, a Denver Domino's Pizza delivery driver who was killed March 17 in Golden, Colo., according to CNN.

"The analysis done by ballistics experts has concluded the gun used by Evan Ebel in Texas was the same weapon used in the shooting death of Tom Clements," the El Paso County, Colo., Sheriff's Department said in a statement obtained by the Fort Worth Star-Telegram. "The confirmation goes well beyond acknowledging the same caliber and brand of ammunition being used, but rather is based on unique, and often microscopic markings left on the casings at both scenes."

The Los Angeles Times reports that the statement went on to explain why authorities aren't sharing all of the available evidence with the public at this time.

"Please be mindful that if other people are implicated in this crime, it is imperative we do all we can to aid in the successful prosecution of those responsible, and that starts with the integrity of the investigation," the statement said.

The sheriff's department is currently investigating whether Ebel had assistance in killing Clements, according to Reuters, which added that a search warrant related to the Leon case revealed that a Domino's shirt or jacket and pizza carrier were found in the trunk of Ebel's car.

Evidence in the three incidents is coming together to paint a portrait of a man who may have gone on a short-lived murderous spree that ended when police officers shot him dead on Thursday.

Ebel had a long rap sheet and was out on parole after a second lengthy stint in prison that apparently included years spent in solitary confinement, according to NBC News.

Reuters added that authorities continue to look for a link between the slayings of Clement and of Kaufman County, Texas, District Attorney's Office prosecutor Mark Hasse in January.

A memorial service was held for Clements in a Colorado Springs church on Monday, during which his widow Lisa spoke about how her "life changed forever" when her husband opened the door while they were watching TV and was shot dead at their home, Reuters reported.