WESTMINSTER, Colo. (AP) -- Acquaintances say a teen arrested in the death of a 10-year-old Colorado girl and in a May attack on a 22-year-old woman often wore black, hung out in the high school cafeteria's "goth corner," and was interested in mortuary science.

Seventeen-year-old Austin Reed Sigg was formally arrested Wednesday in the death of Jessica Ridgeway, who disappeared Oct. 5. Her remains were found five days later.

Sigg had attended Standley Lake High School while also taking classes at an area tech school. He left the district in July after 11th grade and later earned a GED.

Standley Lake classmate Rachel Bradley says Sigg was interested in mortuary science.

Sigg had enrolled at Arapahoe Community College, which has a mortuary science program.