Parolee Evan Ebel ditched his ankle monitor and investigators say he went on to murder Colorado Prison Chief Tom Clements and Nate Leon of Denver. We've now learned nearly 30 other parolees have been convicted of murder in Colorado, just since 2002.
Other parolees await trial, accused of murder.
Seven of those parolees turned murderers are from southern Colorado.
One of them, Aaron Wilkerson, was convicted of murdering 50-year-old Robert Piserchio in Pueblo in 2009. Piserchio was beaten, stabbed and his body set on fire after a group of people burglarized his home.
"Never in a million years could I ever ever believe someone could do something like this to him," said Piserchio's mother, Mary Piserchio when she talked to KRDO after the murder.
Wilkerson was on parole for burglary and drugs.
"I was concerned about system failure and if there was an accountability factor that the DOC had to take a serious look at," said Dan Corsentino, Piserchio's brother-in-law and former Pueblo County Sheriff and Fountain Police Chief.
Corsentino said, after the Evan Ebel murders, he thought back about what happened to his brother-in-law at the hands of a parolee.
The Department of Corrections says parole officers work hard to make sure offenders are supervised and get help finding housing, jobs and treatment.
"We try to work with their community support system: families, employers, faith based organizations," said Kelly Messamore, Assistant Director of DOC Parole and Community Corrections. "Basically give them every opportunity to be successful."
Messamore said the DOC supervises about 14,000 parolees at any given time.
"The people that we supervise are some of the most dangerous people in the state of Colorado," Messamore said. "Having said that, any one instance where an offender victimizes someone is tragic."
She said the success stories are more difficult to measure.
"When offenders fail, it's very noticeable, it's very obvious, we can all see that," said Messamore. "It's a lot harder to measure the new crimes that are prevented by the work parole officers and their support services do."
The DOC says it's trying to make its offender supervision better. It's reviewing how inmates with ankle bracelets, like Ebel, are monitored.
"We've called in the National Institute of Corrections to help do an assessment of our electronic monitoring procedures and overall procedures," said Messamore.