MISSOULA, Mont. -

A Hamilton man who was arrested after responding to an online ad offering sex with a 12-year-old girl in Missoula is now charged with raping his girlfriend's young daughters in Helena.
    
28-year-old Justin Gale Walker appeared in Justice Court in Lewis and Clark County on Monday on two counts of sexual intercourse without consent. His bail was set at $100,000.
    
Walker was arrested in December after responding to an online ad posted by the Montana Internet Crimes Against Children Task Force that purported to be from a woman who had a 12-year-old relative available for sex. He was charged with sexual abuse of children and posted a $25,000 bond in January.
    
Court records say Walker was charged in March with violating an order of protection in Hamilton and posted a $28,000 bond.