LAS VEGAS (AP) — Police say they've arrested a 22-year-old man suspected of killing of a mother and her daughter in their Las Vegas home last week.The department said Friday that Bryan Clay was arrested on child abuse charges and will be charged Saturday in connection with the murders of 38-year-old Ignacia Martinez and 10-year-old Karla Martinez.The two were found dead April 16 inside their blood-spattered home on Robin Street after the woman's 9-year-old son went to school and reported their deaths.Police say Clay is also a suspect in the April 15 sexual assault against a 50-year-old woman.