Authorities in Colorado are still trying to prove a conspiracy by a white supremacist prison gang that continues to grow stronger behind bars.

Parolee Evan Ebel killed Colorado prisons chief Tom Clements and Commerce City father of three Nathan Leon five years ago, before he was killed five days later in a shootout with Texas law enforcement, reported the Denver Post.

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The only person to face justice in the March 2013, killings was Stevie Vigil, a woman who pleaded to buying a gun for Ebel and was sentenced to 27 months in prison.

Ebel left behind a hit list including other Colorado officials, and he contacted other 211 Crew members shortly before and after the killings, which authorities say points to a possible conspiracy — so far they haven’t been able to build a case.

“I would love nothing more than to prove a conspiracy to the 211 Crew,” said El Paso County Sheriff Bill Elder, who believes Ebel acted along when he killed Leon for his Domino’s pizza uniform March 17, 2013, and then shot Clements two days later at the front doorstep of his Monument home.

A confidential informant claims gang general Daniel “Jimbo” Lohr ordered a hit on Clements, and Texas Rangers and some Colorado investigators believe in a gang conspiracy.

But Lohr denies involvement, but he’s surprised he hasn’t been charged in the killings.

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Rick Raemisch, who took Clements’ place overseeing the state’s prisons, has moved the gang’s “inner circle” to state or federal prisons outside Colorado to help break up the cycle of violence.

But the 211 Crew has merged with other white supremacist prison gangs, including the Aryan Syndicate and the American Nazi Party, and the reconfigured gang’s leaders have been charged with or accused of carrying out hits behind bars.