Three days later, on March 17, contractors overseeing the ankle monitoring system notified parole officials that Ebel failed to "make contact."
It was the same day Leon left Domino's Pizza in Denver to make a delivery and never returned. His body was found later that day in a field near the suburban city of Golden, according to authorities.
On March 19, parole officials went to Ebel's apartment to look for him.
According to parole documents, it was evident from the state of the apartment that he left quickly or went into hiding to avoid arrest.
That day, parole officials began the paperwork to return Ebel to prison.
That night, Clements was gunned down as he answered the door of his home.
Shootout in Texas
A day later, on March 20, Ebel was speeding through Montague County, Texas, near the Oklahoma state line, about 700 miles from Monument.
Deputy James Boyd tried to pull the car over for a traffic violation. The 1991 Cadillac Seville had two different license plates, according to an affidavit filed by the Texas Department of Public Safety's Ranger Division.
The Cadillac had barely come to a stop when Ebel opened fire.
"I remember seeing the gun shoot off," Boyd told CNN affiliate KMGH. "I could see the cartridges fly out, at which point I blacked out."
Boyd was hit twice in the chest and suffered a grazing wound to the head. He was saved by his bulletproof vest.
"I got kind of halfway up looking for my mic," Boyd said. "That's about the time I noticed, 'Hey I'm bleeding from the face. Something's not right. I need help.'"
The deputy radioed for help, and soon the law was chasing Ebel, who was barreling down the highway at speeds of up to 100 mph and firing wildly out the window of his car at the deputies in pursuit.
The chase ended when Ebel careened into an 18-wheel truck as he tried to turn onto another road. With the front of his car crushed, Ebel got out and started shooting again.
He didn't hit any officers this time. But they shot him, they said.
Hours later, he was pronounced dead from a gunshot wound to the head.
Ebel left behind telling clues in the wreckage of the Cadillac: a pizza box, pieces of a Domino's uniform, maps of Monument, handwritten directions and shell casings, according to court documents.
The bullets that killed Clements, authorities later determined, came from the 9mm Smith and Wesson handgun taken from Ebel after the shootout.
Did Ebel kill the pizza deliveryman to get his uniform as part of an effort to disguise himself? Did he target Clements because of the prison chief's crackdown on white supremacist gangs in prison? Or was it something else?
Colorado authorities have stopped short of saying Ebel acted alone in killing Clements and Nathan, raising the possibility of wider conspiracy.
On Thursday, authorities announced two members of the 211 Crew were wanted in connection with the investigation into the killings.
They refused to detail how James Franklin Lohr, 47, and Thomas James Guolee, 31, are related to the case.
"Both men are members of the 211 Crew and are considered armed and dangerous; they have associated in the past with Evan Ebel," according to a statement released by Sheriff Terry Maketa of El Paso County, Colorado.
Lohr was arrested Friday morning, Colorado Springs police said. Police had issued multiple misdemeanor warrants for his arrest, and it was not immediately clear if he will be facing new charges.
The only other person charged in the case is 22-year-old Stevie Marie Vigil, who authorities accused of buying the gun used in the killings and giving it to Ebel, who could not purchase one legally because he was a convicted felon.
To date, investigators have refused to detail the relationship between Vigil and Ebel.
One of the grief-stricken wives of the two men killed is tortured by the circumstances that apparently led to the shooting.
For Katherine Leon, the widow with twin 4-year-olds, news that Ebel was released from prison early because of a clerical error is almost too much to bear.
"Outraged doesn't touch how I felt, it doesn't even touch, sick to my stomach, irate. How do you feel when something like this happens?" she told CNN.
"I mean, really, every day it's been getting worse. Every day I find something new out, and this was just the cherry on top of a really messed up month to say the least."
Their question remains the same: Why did it have to happen?
A portion of the answer may lie with a judge's warning to Ebel.
"It's not too late for you to have a productive life," the judge said during Ebel's 2008 sentencing, according to transcripts, "but you're never going to make it on the outside with the attitude that you still have with you on the inside."
Ebel didn't heed the warning.