DENVER (AP) — Three teens accused of driving around and throwing large rocks at passing cars, one of which investigators say killed a 20-year-old woman, circled back to take a photo of her crashed car as a “memento,” according to court documents released Thursday. Bopp told sheriff’s investigators he asked to be taken home after he saw the three others taking landscaping rocks from a Walmart parking lot and loading them into Karol-Chik’s pickup truck, because he said he knew something bad was going to happen, according to the documents. Investigators believe the teens were involved in several other similar incidents in which rocks between 4 and 6 inches (10 and 15 centimeters) in diameter and weighing 3 to 5 pounds (1