PHILADELPHIA (AP) — Police in Philadelphia say a second suspect is in custody in the assault of a University of Pennsylvania graduate student who was hit with a brick.

A police spokesman said Saturday that 18-year-old Dajuan Dantzler turned himself in Friday night to face charges. Twenty-year-old Lance Ryan was arrested earlier and is charged with assault.

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Authorities said a 26-year-old male graduate student beaten and robbed Nov. 5 was left with serious head injuries, including a fractured skull.

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Investigators believe they may be tied to two similar robberies. Another person walking home from his bartending job the night before had been attacked and struck multiple times with a brick.

It’s unclear whether Dantzler has an attorney; Ryan is represented by the public defender’s office, which couldn’t be reached for comment.

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