Published: Jul 22, 2014 11:22 AM EDT

MIAMI (AP) - A South Florida man stabbed his ex-girlfriend's 11-year-old daughter and tried to make her death look like a suicide, according to police.
    
Miguel Ruiz Lobo did not get along with Martha Guzman, Miami Police Chief Manuel Orosa said Monday.
    
"She convinced her mother to dump him," Orosa said.
    
The girl's mother, Amaury Alvarenga, found her June 25 in a pool of blood with a knife in her throat.
    
Police tell The Miami Herald (http://hrld.us/UkL2FU) that Lobo tried to make the slaying look like a suicide but sliced through tendons in the girl's wrists, which would have made it impossible for her to stab herself in the throat.
    
According to police, DNA found in skin under Martha's fingernails has been matched to Lobo, who had cuts and scratches on his body when he was first contacted by investigators.
    
"It shows she was fighting him off, but he was so big she wouldn't have been able to," Orosa said.
    
Lobo was held Tuesday without bail on charges of first-degree murder and burglary. Miami-Dade County jail records did not show whether he had an attorney.
    
Alvarenga said Martha had a history of cutting herself, but she had talked with a doctor about it and she would not have committed suicide.
    
According to the Florida Department of Law Enforcement, Lobo was arrested in February for driving without a license, but he had no other criminal history.
    
Alvarenga filed a petition March 31 with Miami-Dade County Circuit Court to place a restraining order against Lobo. In the petition, Alvarenga said Lobo had recently accosted her while he was intoxicated, grabbing her shirt as she waited for a ferry to take her to work. Security guards subdued Lobo and police were not called.
    
Acting Circuit Court Judge Judith Rubenstein initially denied the petition, ruling that "there is no appearance of an immediate and present danger of domestic violence."
    
Alvarenga's request was denied for a final time April 14.
    
Martha's parents buried her in their hometown of Olanchito, Honduras.
    
"I feel a little better knowing he was arrested. I know this is not going to bring back my daughter," Jorge Guzman said.
    
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Information from: The Miami Herald, http://www.herald.com

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