It's a brutal and unsettling story, made all the more so by the fact that the perpetrator was a 22-year-old man with no connection to the victims. Bryan Clay was arrested Friday for the April 15 rapes and bludgeoning murders of a Ignacia Martinez and her 10-year-old daughter Karla.

Ignacia's husband Arturo Martinez was badly injured in the attack and is still recovering in the hospital. His two other sons were left unharmed.

"This was a complete stranger killing a mother and daughter and attacking the father," [Lt. Ray] Steiber told The Associated Press. "I've been doing this (police work) 24 years, and you don't see cases like this. I can't even put this into words."

Saying "there's no rhyme or reason to why," Steiber admitted that investigators have had trouble establishing motive. Nothing was taken from the house, and the two Ignacio sons were left alone. It was when the 9-year-old son reported what had happened to his school counselor the next day that Las Vegas police were notified.

In addition, Clay has been linked to the rape and assault of a 50-year-old woman, also on April 15. Clay chased her from an intersection into a desert area, where he raped and beat her. Again, this attack was seemingly at random.

Clay is currently being held without bail.

[Image via AP]