Greg Kelley, an 18-year-old Leander high school football player, has been arrested a second time on charges of sexually assaulting a second four-year-old boy.
Police learned of the second incident four days after Kelley was arrested the first time. The victim told his stepfather who then told police.
Kelley was arrested earlier this month and charged with aggravated sexual assault of a child.
Both four-year-old boys attended an in-home daycare at a residence where Kelley was living.
The Cedar Park Police Department is investigating whether there could be more victims.
Kelley is being held in the Williamson County Jail on $35,000 bond.