Surviving twin out of hospital

An undated photo released by the Hermeler family shows Australian twins Candice, left, and Kristin Hermeler. Photo / AP

Candice Hermeler, the surviving Australian twin from last week's double suicide pact at a Colorado shooting range, has been discharged from hospital.

The 29-year-old was in a serious condition just days ago after suffering a self-inflicted gunshot to the forehead while her sister, Kristin, died at the range.

Deborah Gosling, a spokeswoman for the Swedish Medical Centre in Colorado where Candice was hospitalised since the November 15 incident, confirmed she was no longer at the hospital.

"Yes, she was discharged this morning," Ms Gibson told AAP.

The hospital would not reveal any other details, including whether Candice's condition had improved enough to leave the hospital or whether it was a decision made by her parents, Ernest and Kelsay Hermeler, to move her to another medical facility.

The discharge comes after video surveillance footage of the twins at the Family Shooting Centre gun range was released.

Fresh links were also uncovered of the twins' fascination with the 1999 Columbine High School shooting tragedy in Colorado where two teenage students killed 13 victims before turning the guns on themselves.

Denver media reports on Tuesday said letters were found in the twins' luggage from the family of one of the Columbine killers, Dylan Klebold. A letter from the family of a Columbine murder victim, Corey DePooter, was also found in the twins' luggage.

Sheriffs investigating the suicide had said the only link found between the twins and Columbine was a photocopy of a Time magazine article dedicated to Columbine.

The parents of a Columbine survivor, Brooks Brown, also told the media the twins had mailed and phoned them weeks after Columbine.

- AAP