Police are investigating a new lead that a man accused of recording himself sexually assaulting young children may have run a daycare with an ex-girlfriend. 

Tad Costin has already been charged with aggravated sexual assault of a child in Harris County.  Authorities investigating the case believe Costin may have been recording sexual acts with children since 1999. 

On Friday, Costin was also charged in Brazoria County with possession of pornography.