Authorities say a New Jersey man has been charged with sexually assaulting and killing his new girlfriend's 2-year-old daughter.

Camden County prosecutors said Friday that 22-year-old Michael Disporto Jr., of Manahawkin, was charged Thursday.

Authorities say the girl died Tuesday from blunt force trauma to the head.

The girl's mother, Amber Bobo, has been charged with second-degree endangering the welfare of a child. Investigators say she waited six hours after noticing injuries on the girl and after she started vomiting to call 911.

Disporto was being held on $1.5 million bail. It wasn't immediately clear if he and Bobo had attorneys to comment on their behalf.

Investigators say in a probable cause statement that Disporto and Bobo had been dating for two weeks.