A former nanny in Pasco County was arrested after one of his employers said he sexually abused a 4-year-old girl he was supposed to be watching.

Jami Hastings said she met Daniel Colarusso at her former apartment complex in Holiday. She said he babysat for one of her neighbors and her then husband hired him to do maintenance work. Hastings said the couple even let Colarusso stay in their guest bedroom for about a month.

"He was a very nice guy---trustworthy," Hastings said. "Seemed like he loved kids."

But things quickly went south. 

Hastings said Colarusso broke into her ex-husband's bank account, so they fired him.

Later, while cleaning out the guest room, Hastings found a memory card and held onto it. Months later, she said she popped it into her own cell phone and was shocked at what she found.

"I went into my gallery and just started sliding through pictures and what I saw was horrible," Hastings said.  "I didn't even want to keep going."

Hastings said they were explicit photos of Colarusso, sexually abusing a 4-year-old little girl who she immediately recognized as the child Colarusso used to babysit for at the apartment complex.

Hastings said she called the sheriff's office and they tracked Colarusso down in Sarasota, where he is being held pending extradition back to Pasco County. 

Detectives said he will face multiple counts of possession of child pornography as well as sexual battery.

As for how Colarusso became the little girl's babysitter in the first place, detecitves say the mother placed an add for a live-in babysitter on Craigslist, without any sort of background check.

"She said, he said the right things and she decided to bring him into her home, and did not understand who this person really was," said Detective Anthony Bassone.

At a news conference on Wednesday morning, the sheriff's office praised Hastings for coming forward.

"I feel pretty good about that," Hastings said.  "But I'm glad the victim is safe. I'm glad her family knows."

Hastings said she's glad she could prevent it from happening to anyone else.