(CNN) — Colorado investigators are in Decatur, Texas, Friday morning eager to examine evidence found in a black Cadillac whose driver might have been involved in the slaying of Colorado’s prison system chief.

The driver was Evan Ebel, a former Colorado prison inmate, El Paso County, Colorado, Undersheriff Paula Presley confirmed to CNN Friday. He died Thursday evening after being shot at the end of a high-speed chase that followed the wounding of a deputy.

Ebel is the focus of the investigation into the shooting Tuesday of Colorado corrections chief Tom Clements, who was shot dead Tuesday evening as he opened the door of his rural Colorado home. Witnesses said a black car described as possibly a Cadillac was nearby at the time of the shooting.

Ebel is a parolee and was a gang member in the prison system, Presley told CNN.

“That is information that we’re receiving from the Department of Corrections,” she said.

Investigators are trying to figure out if there was possibly a conspiracy inside the prison system to kill Clements, Presley told CNN.

And, she added, investigators have evidence from the scene of Clements’ killing in Monument, Colorado, that they may be able to link to the Cadillac.

“There is evidence in that vehicle that will be of interest of us,” Presley said on CNN’s air.

‘Running about 100 mph’

Thursday night a Montague County, Texas, deputy tried to pull the car over, authorities said, and the driver responded by shooting him twice in the chest. Another bullet grazed his head. The deputy was wearing a bulletproof vest and managed to call for help, according to law enforcement. He is in serious condition at a Dallas-Fort Worth-area hospital.

That incident sparked the high-speed chase, which ended about 30 miles away in Decatur, after city police tried to pull the driver over. The driver fired at a patrol vehicle and at Decatur police Chief Rex Hoskins, whose car was parked in the median.

“I would say he was running about 100 mph, and he had his left arm out the window and he was just shooting,” Hoskins said.

Then, the driver turned his Cadillac onto another road and slammed into an 18-wheel truck, according to authorities. With the front of his car crushed, the driver got out and started shooting again.

He didn’t hit any officers, but they shot him.

Ebel was taken to the hospital and kept alive on machines, but died later Thursday night, according to authorities.

Another twist in the case is emerging. Denver police say there’s a strong connection between Clements’ killing and the murder of a 27-year-old pizza delivery driver Sunday in a remote area outside the city.

Nathan Collin Leon disappeared from work in Denver and was found dead in Golden.

Investigators from that case are also in Texas looking for answers.

Saudi national’s case considered in probe

The Texas incident came the same day that Colorado investigators said they were looking closely at one criminal among the thousands that Clements’ oversaw in the state’s prison system — a Saudi national named Homaidan al-Turki.

On Thursday Undersheriff Presley acknowledged the media speculation over al-Turki, who was convicted of sexually assaulting his housemaid at his Aurora, Colorado, home seven years ago.

Earlier this month, Clements denied al-Turki’s request to serve the remainder of his Colorado prison sentence in Saudi Arabia, records show.

Investigators, she said, are still trying to determine whether “there may have been some motivation or legitimate threat” related to al-Turki’s case, adding that “we have not identified that specifically as a threat.”

Al-Turki is now at the Limon Correctional Facility. CNN has not received a response to its requests for comment from his lawyers.

Late prisons chief described as ‘amazing man’

Clements had been chief of Colorado’s prison system for a little over two years. He took the job in January 2011 after working for 31 years as part of Missouri’s Department of Corrections.

In his time in Colorado, he’d made a big impression.

“He was an amazing man, an amazing man,” Alison Morgan, spokeswoman for Colorado’s Department of Corrections, said Thursday. “An inspirational leader.”

Some witnesses said they saw a man driving a vehicle — possibly a Lincoln Continental or a two-door Cadillac — away from the neighborhood a short time after the shooting. Others reported seeing a black, boxy vehicle with its engine running but no one inside on Clements’ street.

Asked Thursday whether the prison chief’s killing may have been a professional hit, Presley from the El Paso County, Colorado, Sheriff’s Office said, “We don’t have any specific information that would lead us to that.”

The central Colorado county sheriff office’s major crimes unit has received more than 100 solid tips about the incident, including a growing number of witnesses describing a black car then in the area.

Meanwhile, the mourning continues for Clements.

His funeral will be held Sunday, Gov. John Hickenlooper’s office said, and he’ll be remembered at a public memorial service in Colorado Springs the next day.

Jim Spellman reported from Colorado and Ed Lavandera from Texas. Ashley Fantz wrote this story in Atlanta.

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