MIAMI -

A man has been arrested in connection with the death of an 11-year-old Miami girl in June.

Miami Police Chief Manuel Orosa announced the arrest Monday of Miguel Ruiz Lobo.

Lobo, 42, is accused of killing Martha Guzman on June 22.

Orosa said Lobo, who was an ex-boyfriend of Guzman's mother, used a hidden key to enter the girl's Little Havana apartment while she was home alone. He said Guzman slashed the girl's wrists to make it look like she killed herself.

"He restrained her and after he killed her he slashed her wrists, but the wrists were slashed so far deep that they almost came off her arm and there's no way that a suicide victim would go that deep to be able to cut almost her entire wrist off her arm," Orosa said.

Orosa said Lobo was upset Guzman convinced her mother to break up with him.

According to the police report, surveillance video showed Lobo entering the home.

The police investigation found DNA underneath Guzman's fingernails linking Lobo to the crime.

Lobo was arrested on charges of first-degree murder and occupied burglary.