PITTSBURGH -- The ex-boyfriend of a University of Pittsburgh student found slain in her off-campus apartment on Sunday has been arrested in Myrtle Beach, South Carolina.

Pittsburgh police have confirmed the arrest of 21-year-old Matthew Darby, but not provided details about the arrest at about 12:45 a.m. Wednesday.

Darby was charged Tuesday evening with criminal homicide in the death of Alina Sheykhet. Police say they found a claw hammer and two knives in a sewer drain near Sheykhet's apartment.

Darby's attorney read a statement from the suspect's parents earlier Tuesday begging him to surrender, but not addressing the merits of the charges.

Darby has pleaded not guilty to charges he raped another ex-girlfriend earlier this year in Indiana County, which is about 45 miles northeast of Pittsburgh.

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