Two Evergreen High School parent groups raised concerns about the availability of school resource officers in the hours before Wednesday’s shooting that critically wounded two high school students, parents said Friday.

Lone Tree police arrested a 33-year-old man Friday in connection with a woman found dead last week.

Desmond Holly’s focus on the 1999 massacre at Columbine High School is a central feature of these online extremist ecosystems, an expert said.

A Colorado funeral home owner who acknowledged abusing 191 corpses withdrew his guilty plea Friday and will go to trial, after a judge rejected a plea agreement in a rare decision.

Denver police arrested a juvenile Thursday on suspicion of first-degree murder in connection with the shooting death of another minor late last week.

Evacuations have been lifted at the University of Colorado Boulder, and most buildings have reopened, after university police determined a bomb threat was false.