HOUSTON (AP) - A Louisiana man has pleaded not guilty to extorting money from a Texas A&M University professor about a week before the professor jumped to his death from a campus building in January. A Houston judge on Tuesday ordered the 37-year-old Metairie, La., man to remain jailed without bond. Prosecutors say the defendant lured 59-year-old communications professor James Arnt Aune into a sexually explicit online relationship with what he thought was an underage girl. They say the man later contacted Aune, told him he was the girl's father, and threatened to expose him unless he paid $5,000. The Associated Press isn't naming the defendant to protect his underage daughter's identity. The girl told Louisiana authorities in 2011 that her father used nude images of her "to scam men" she met online.