Police say Hargrave was known to frequent the ice arena at the Fiesta Rancho and befriend single mothers with sons who played hockey. The victim's mother told police that other people thought he was "creepy.".
After the suspect was told the victim's family had called police, he tried to commit suicide by slashing his wrists, police said.
He was already booked in the Clark County Detention Center. He pleaded not guilty to the original charges during a hearing last week.
Anyone with information about case is asked to Metro's Sexual Assault Section at (702) 828-3421, or to remain anonymous call Crime Stoppers at (702) 385-5555.