Austin Sigg, Jessica Ridgeway's accused killer: New mug shot, new cell -- in adult jail

Big photos below.

Update: Headlines noting that seventeen-year-old Austin Sigg has been charged as an adult in the kidnapping and killing of Jessica Ridgeway, a ten-year-old Westminster girl, are a bit redundant, since documents to that effect were filed last month; see previous coverage below. But his court visit yesterday was significant for marking his transfer from a juvenile facility to adult jail -- a move that triggered a new mug shot of the accused teen killer.

As we've reported, Jessica was on her way to school on October 5 when she disappeared. After an extensive search, her body was found in an open space area the following week -- and reports say it was "not intact." At that point, the investigation shifted from a rescue operation into criminal mode. But the case was broken when Sigg's mother, Mindy, phoned police with information that led to her son's arrest for Ridgeway's murder, as well as an attempted abduction in May of an adult female jogger at Ketner Lake, near Sigg's home.

Inside Austin Sigg's new home.

In all, Sigg, whose interests are said to include criminal investigations and forensics, faces seventeen counts -- and several weeks ago, Jefferson County District Attorney Scott Storey revealed that he would be charged as an adult owing to the seriousness of the offenses.

Making the decision easier: Sigg was only a few months shy of his eighteenth birthday. Nonetheless, he was housed in juvenile lock-up until that facility requested he be transferred to an adult jail. One reason, according to 9News, is the lack of a proper space in which to keep him away from other youthful prisoners, most of whom are being detained on far less serious charges. Indeed, the room he was in is said to have been designed to hold distraught or out-of-control youths for a few hours, not long term.

For that reason, Sigg is heading to Jefferson County's adult jail -- but he won't be mingling with the general population. Instead, he'll be in what's referred to as a "special housing unit" in which he'll be isolated from other prisoners for at least the next 52 days.

At that point, he'll turn eighteen -- old enough to join the rest of the inmates. But whether he will hasn't been determined, and probably won't be until he marks his birthday. Until then, he'll reportedly be escorted by a deputy everywhere he goes.

Talk about a creepy assignment.

Look below to see the new mug shot of Sigg, taken when his transfer to the adult jail was complete, as well as two videos -- the first a 9News piece about the latest developments, the second a Fox31 item from last month that got lost in the shuffle; it pertains in part to reports that Sigg was treated for an addiction to pornography.

Austin Reed Sigg.

Continue to read more of our coverage about the arrest and charging of Austin Sigg for the death of Jessica Ridgeway.