Weeks before Colorado prison chief Tom Clements was shot to death execution-style in the doorway of his home -- a shooting now linked to a white supremacist later killed in a North Texas shootout -- corrections officials shook up the suspect's prison gang, the 211 Crew.The Denver Post has learned that Clements' Department of Corrections staff divided a core group of 211 leaders by transferring some to another correctional center, diluting their numbers and strength."There was a group up there, and [prison officials] decided to break them up," said a corrections official who spoke on the condition of anonymity.Now prison officials and others are investigating whether Clements' killing was an ordered hit or whether the gunman was acting alone, a source told the paper.Court papers obtained in Texas disclose that the same type and brand of 9 mm shell casings were found at Clements' Monument home and at the scene of a gunbattle with Evan Spencer Ebel, 28.On Saturday, a sheriff's spokesman in Colorado's El Paso County said "strong, strong evidence" collected in Texas after Ebel's death provided a lead in the shooting of Clements.Ebel -- a 211 "soldier" with an extensive criminal history -- was killed Thursday in Decatur during a shootout with sheriff's deputies and other officers after a 100-mph chase in a black Cadillac.The car is also believed to be tied to the scene of Clements' killing Tuesday night in a rural area north of Colorado Springs and to the slaying of a Domino's Pizza delivery driver two days earlier. Texas authorities also found a Domino's delivery box and jacket or shirt in the trunk of Ebel's car.Lt. Jeff Kramer, the sheriff's spokesman in El Paso County, said that investigators do not know the motive for Clements' killing but that there was no sign of a home invasion.It was not known whether Ebel knew that Clements was the state's top prison official, he said.A bizarre linkA darkly odd connection emerged among Ebel, Clements and Colorado Gov. John Hickenlooper when the governor confirmed Friday that he was a longtime friend of Ebel's father, attorney Jack Ebel.Jack Ebel testified before Colorado lawmakers two years ago that solitary confinement in a Colorado prison was destroying his son's psyche.When Hickenlooper interviewed Clements for the top prison job, he mentioned the case as an example of why the prison system needs reform.But the governor said he did not mention Ebel by name.Later, Clements eased the use of solitary confinement and tried to make it easier for people held there to re-enter society.Hickenlooper's spokesman said Clements did not know specifically who Ebel was.Nothing indicated that the governor's ties to Jack Ebel, with whom he once worked, played a role in the shooting.Hickenlooper said he was not involved in Evan Ebel's parole.He was paroled Jan. 28 as part of a mandatory process. He had most recently been sentenced to four years for punching a prison guard in 2008, according to state records.Kramer stressed that investigators have not confirmed a link between Ebel and Clements' death.Tests were under way to determine whether the weapon used to kill Clements was the same one recovered from Ebel in Texas.Results could be available Monday, he said.The suspect's father said in a statement Saturday that he is "profoundly saddened by the recent events involving my son" and asked for privacy as the family grieves.Others in danger?There was speculation in Colorado on Saturday that the mass transfers of 211 Crew leaders this month might have provided the impetus for the gang to seek retaliation against prison officials.System spokeswoman Katherine Sanguinetti said key 211 members were moved to blunt their power base and stem gang recruiting.The transfers were prompted after a 211 member hanged himself March 7, the day after being transported to a jail for a court appearance, a department source told the Post. The gang's name stems from the California penal code for robbery, "a 211."Its founder, and reputed leader, has been identified as Benjamin Davis, who is serving a 108-year prison term for racketeering and conspiracy and solicitation to commit assault.Davis, who is incarcerated at the Buena Vista correctional center, reportedly created the group at age 20 while in the Denver County Jail 18 years ago.The murder investigation is even more urgent because if a gang leader ordered Clements' hit, other state officials could be targeted."Obviously, something is happening with the 211s," a prison department source said."It means other people could be in danger."Since Clements' slaying, Colorado authorities have increased security for Hickenlooper and put all state-run prisons in modified lockdown as precautions.The lockdown will not be lifted until after a public memorial service for Clements today.