Video inside Rice's home showed Castro slowly enter after unknowingly setting off a security system sensor, and he calmly walked through the apartment before stopping in a doorway.
"I saw that someone opened the door, and no one comes into my house around that time," Rice said. "My husband is at work, my brother is in school. So, I went to check the cameras, and I noticed there was someone, a big guy that I didn't know."
Rice said she was putting her 15-month-old son down for a nap in the apartment around 12:30 p.m. Friday when the incident occurred.
Security camera footage shows Rice confronting Castro in the home.
"When I came out of the room, I asked him, 'what are you doing in my house?’" Rice said. "And he’s like, ‘Oh, the door was open, and I got worried. I came in to check that everything was OK.’ I’m like, ‘The door wasn’t open.’ He kept saying, ‘No, no, the door was open. I wanted to make sure everything was OK.’"
Castro finally left, and Rice proceeded to call the police.
"Thank God he wasn't aggressive or had anything on him," Rice said.
Now, the Rice family is being extra cautious at home.
"It's scary," Rice said. "My husband and I are going to have to set the alarm every time I'm home by myself, because I don't feel safe anymore."
Police believe the door had been unlocked, and say there don't seem to be any other reports of similar incidents in Chelsea.
Castro was arrested last June for a similar crime, which was also caught on video. That case is still pending in Chelsea District Court.