(CNN) — Colorado Springs (CNN) --
Days after he led police in a wild car chase that ended in a hail of gunfire, authorities are investigating the driver's links to two Colorado killings. And whether he has ties to a third shooting, in Texas, earlier this year.
Suspect Evan Spencer Ebel, 28, was fatally shot in the head Thursday after he opened fire on the deputies chasing him in in Montague County, Texas.
Investigators have found evidence linking him to the slaying of a Colorado prison chief and a pizza delivery driver this week.
And the FBI is looking for possible evidence linking the January slaying of Kaufman County prosecutor Mark Hasse to Tuesday's killing of Colorado prison chief Tom Clements at a Denver suburb.
"This is part of routine investigative work when two crimes occur under somewhat similar circumstances," the Kaufman County Sheriffs Office said in a statement Friday. " If any link is found, or a possible link is disproven, that information will be released at the appropriate time."
In an affidavit, Texas authorities detailed what they believe links him to the prison chief's killing.
Of key focus in the affidavit is a 1991 black Cadillac authorities say the suspect was driving in a wild, high-speed chase Thursday. He opened fire on sheriff's deputies before slamming into an 18-wheeler, climbing out of the wreckage and opening fire again.
Witnesses reported a similar vehicle -- a black, boxy car with Colorado license plates -- near the prison chief's house the day he was killed.
Among the links in the cases, according to the affidavit, are shell casings from a 9mm handgun found at Clements house. They are the same brand and caliber used in the shooting of James Boyd, a Wise County, Texas, sheriff's deputy who tried to pull over the suspect.